Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b90fe08fc6fa48e…

MALICIOUS

PDF

45.4 KB Created: 2020-07-22 04:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e92fb3161f905c039bff0e82275a9c81 SHA-1: e12167952d0f3f5183cba4dd9c3f46725d9a4b6d SHA-256: 3b90fe08fc6fa48e987b3be79eae47c4523dc0d64e71d72a3d1b28fd199ad1a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one pointing to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, suggests a lure related to a 'reloading manual'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm or SEO manipulation tactic to drive traffic to malicious sites. No scripts were extracted, limiting the analysis of direct payload execution.

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.ru/wb?keyword=sierra%20reloading%20manual%20online%20pdf
    • http://files.aleksandrvoinov.com/uploads/1/3/2/7/132710671/sotulazolekugud_giruguwur_zawoxewajanori.pdf
    • http://files.freefringefest.com/uploads/1/3/1/3/131382330/2497916.pdf
    • http://files.henningrestorations.com/uploads/1/3/1/4/131406985/saxeg_zetefiwowinuta_kovubamo.pdf
    • http://files.scope-for-growth.com/uploads/1/3/0/7/130775952/3e3c641.pdf
    • http://files.henningrestorations.com/upl
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/topafugetiworizusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/48866844697.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/limuroxategeborajaka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/gilagevu.pdf
    • https://noginamopak.files.wordpress.com/2020/06/bakaj.pdf
    • https://xoxugopaba.files.wordpress.com/2020/07/78077510297.pdf
    • https://tokefinavat.files.wordpress.com/2020/07/kebizozedepanizevovati.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/gideserosaxojosajub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7133/files/pixatufuvuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/6251/0236/files/90893219911.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/disum.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/pejakazinad.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/75602913897.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007403.bin
f1621e591103625eb45c0cfdbafd9925fe115ec1dd4d383c21da752bed7c515f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7403 5088 bytes
font_01_sfnt_off0000852a.bin
b168ccceeac88eaec5e9cfefee1fce62ad753360bf75ff5c09e2bb33b29410a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852A 10236 bytes

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