Malicious PDF — malware analysis report

Static analysis result for SHA-256 899d46c4bc917584…

MALICIOUS

PDF

41.1 KB Created: 2020-07-20 23:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 6085ac66de467f28817ce1fd8b5bcaef SHA-1: 794d6d0a3b721ce471233e8d234d7e25a33e5f3c SHA-256: 899d46c4bc917584b528e978c97a2ee6da2283ebfccd9e3f60a8b8e2b3cba134
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.com) that is flagged as malicious. This indicates an attempt to direct users to potentially harmful content, likely a phishing page or a download site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure suggests a link farm designed to obscure the final destination.

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.com/wb?keyword=maquina%20de%20coser%20manual%20costa%20rica In PDF document text
    • http://files.mcveyoutdoors.com/uploads/1/3/2/6/132695994/5594059.pdfIn PDF document text
    • http://files.growyourteaching.com/uploads/1/3/0/7/130775341/deburew.pdfIn PDF document text
    • http://files.nationalhoteltoowoomba.com/uploads/1/3/0/7/130775396/3254230.pdfIn PDF document text
    • http://files.rodrigoforhire.com/uploads/1/3/0/7/130775677/dilefevikawugiginu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4861/5579/files/naxifawidokonoxurenuvimom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/sinap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59526866216.pdfIn PDF document text
    • https://nobivewix214068776.files.wordpress.com/2020/06/vogevomolevevuzagaxetamel.pdfIn PDF document text
    • https://nebotibubir.files.wordpress.com/2020/06/81360102334.pdfIn PDF document text
    • https://bizesipu.files.wordpress.com/2020/06/voride.pdfIn PDF document text
    • https://sosabufuji.files.wordpress.com/2020/06/selobedizadunifamumufon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/tonipubojakak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/49537681928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/27641644708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8406/9526/files/lirifepavodes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/wuvujinez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1030/1847/files/75333422400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/xuwowaxita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/11228316064.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_off000060de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 5096 bytes
SHA-256: 1970907820b868bff640983e6b9055851f71bb87d5fb228b510ce9ddeb4dd376
font_01_sfnt_off0000720c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720C 10752 bytes
SHA-256: 5b9279e2f2a1b7a96aeaa3a407aa15c716d6d915d97517ed4bbade39846fa9b6