Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a27c27b69e8370…

MALICIOUS

PDF

44.2 KB Created: 2020-08-03 04:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e991b8a56543327a04a05ed099e5b334 SHA-1: a9adf144cd9e9d16b80c260042ff9cca89061835 SHA-256: 16a27c27b69e83703e1a2a5e198fa2feb29ae64db3d0056085e273f8c67dea9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating an attempt to drive traffic to malicious sites. The embedded content suggests a lure related to repair manuals, likely to trick users into clicking malicious links. 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/pify?keyword=briggs+and+stratton+engine+repair+manual
    • http://gewikob.chriscraneportfolio.com/uploads/1/3/0/7/130776031/tisaxomo-jexapepafob-jatatufosil-xepasedijof.pdf
    • http://files.eatwellwithwilson.com/uploads/1/3/1/4/131483371/5683681.pdf
    • http://files.midwestnettingsolutions.com/uploads/1/3/1/0/131070398/jovibososazekajagata.pdf
    • http://files.jimenavalenzuela.com/uploads/1/3/0/7/130776661/tasobenuzurid.pdf
    • http://files.purepillowtalk.com/uploads/1/3/1/3/131381480/375822.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/96455563442.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/xakezufunufeluguborex.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/wow_classic_heavy_leather_farming.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/html_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/82877073804.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/steam_code_redeem.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/47779007007.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/vuwowosijadaximudageliz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/youtube_link_full_screen_autoplay.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/dodonefawupimifelevat.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/11214316138.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000626d.bin
a4a05849e8f8371305415064d5b86986582d920686fd4bc46b11650c25d3ba7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 5208 bytes
font_01_sfnt_off00007402.bin
ddfcf574e34ed8920b104c40b31a53429148b12755c3cb2f9be510b8ed363ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7402 9816 bytes
font_02_sfnt_off00009598.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9598 4324 bytes

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