Malicious PDF — malware analysis report

Static analysis result for SHA-256 34313b07b82d5a80…

MALICIOUS

PDF

44.7 KB Created: 2020-07-19 22:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 40f8da0a2af9886f1a25a6c24f129b68 SHA-1: 9455fa1d6eb1df4bea6d85d87dfc6a63df2dc9e5 SHA-256: 34313b07b82d5a808bcb9aff01e3acb10ae830fce98def166739f8d4fac6e3ee
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to redirector infrastructure, which is a common tactic for distributing malicious content or phishing pages. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to lead the user to harmful sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=android%20developer%20manual%20pdf In PDF document text
    • http://files.jjjohnsonauthor.com/uploads/1/3/1/4/131437268/lotoxaboxubuw.pdfIn PDF document text
    • http://files.stjohnbaptistpreschool.com/uploads/1/3/0/8/130813395/4727566.pdfIn PDF document text
    • http://files.buzzsalonnorthfield.com/uploads/1/3/1/4/131483772/sulum.pdfIn PDF document text
    • http://files.mearabrielle.com/uploads/1/3/1/3/131379923/vozovonagonopom-pejafor.pdfIn PDF document text
    • http://files.flambeauagzone.org/uploads/1/3/1/4/131406827/givabirejefe-dekilefawabomu-rewomez-gelaxakok.pdfIn PDF document text
    • http://files.ragetoknow.com/uploads/1/3/0/8/130874281/wupusunidalol_kulodesamolol.pdfIn PDF document text
    • http://files.wazobiaarts.com/uploads/1/3/2/6/132681295/rivelugoxosejip-silixunuluta-pijaxizaze.pdfIn PDF document text
    • http://files.alexcoxgraphics.com/uploads/1/3/2/7/132740905/xuligufobut.pdfIn PDF document text
    • http://files.crystalbluffs.com/uploads/1/3/1/4/131437753/6369020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://negenuwi.files.wordpress.com/2020/07/sutezirikasujebozida.pdfIn PDF document text
    • https://bifipararavo.files.wordpress.com/2020/07/dipubofefogizuxonarivinud.pdfIn PDF document text
    • https://revipob.files.wordpress.com/2020/06/pinanusenebisazata.pdfIn PDF document text
    • https://bijufexabez.files.wordpress.com/2020/06/vituzaxowowe.pdfIn PDF document text
    • https://lemobiruwira.files.wordpress.com/2020/07/suketedufegigunijolujip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/89031871014.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/xokilozujodikobowafelumal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/96128491521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/39690844945.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/96920529443.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63016720996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/5755377164.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E8 4860 bytes
SHA-256: af67d4f394500af0abc565cd9cb6fee4c0e770e4557d10c39338f77149a62479
font_01_sfnt_off0000814f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x814F 10560 bytes
SHA-256: 619a399485f31b458cbdce4651587563f421be0923aec897cc2b9de6d11cab82