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)
MD5: 40f8da0a2af9886f1a25a6c24f129b68 SHA-1: 9455fa1d6eb1df4bea6d85d87dfc6a63df2dc9e5 SHA-256: 34313b07b82d5a808bcb9aff01e3acb10ae830fce98def166739f8d4fac6e3ee
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirectors and potentially malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, suggests a lure related to 'android developer manual pdf', likely intended to trick users into clicking through to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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
    • http://files.jjjohnsonauthor.com/uploads/1/3/1/4/131437268/lotoxaboxubuw.pdf
    • http://files.stjohnbaptistpreschool.com/uploads/1/3/0/8/130813395/4727566.pdf
    • http://files.buzzsalonnorthfield.com/uploads/1/3/1/4/131483772/sulum.pdf
    • http://files.mearabrielle.com/uploads/1/3/1/3/131379923/vozovonagonopom-pejafor.pdf
    • http://files.flambeauagzone.org/uploads/1/3/1/4/131406827/givabirejefe-dekilefawabomu-rewomez-gelaxakok.pdf
    • http://files.ragetoknow.com/uploads/1/3/0/8/130874281/wupusunidalol_kulodesamolol.pdf
    • http://files.wazobiaarts.com/uploads/1/3/2/6/132681295/rivelugoxosejip-silixunuluta-pijaxizaze.pdf
    • http://files.alexcoxgraphics.com/uploads/1/3/2/7/132740905/xuligufobut.pdf
    • http://files.crystalbluffs.com/uploads/1/3/1/4/131437753/6369020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://negenuwi.files.wordpress.com/2020/07/sutezirikasujebozida.pdf
    • https://bifipararavo.files.wordpress.com/2020/07/dipubofefogizuxonarivinud.pdf
    • https://revipob.files.wordpress.com/2020/06/pinanusenebisazata.pdf
    • https://bijufexabez.files.wordpress.com/2020/06/vituzaxowowe.pdf
    • https://lemobiruwira.files.wordpress.com/2020/07/suketedufegigunijolujip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/89031871014.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/xokilozujodikobowafelumal.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/96128491521.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/39690844945.pdf
    • https://cdn.shopify.com/s/files/1/0431/0443/6390/files/96920529443.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63016720996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/5755377164.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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