Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3692c0669b2ff96…

MALICIOUS

PDF

44.7 KB Created: 2020-07-25 21:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 158d4666325cfc94ff9487755753b84f SHA-1: b1e86e9ffc0029831ed67ae9317d4be70093e413 SHA-256: a3692c0669b2ff9660487eb2a7d1b6d5039a109915f8bc189f1ce7b9e6c0d95d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/wb?keyword=modele%20bolerouri%20tricotate%20manual', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to knitting patterns, likely serving as a lure to encourage clicks on the malicious links.

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=modele%20bolerouri%20tricotate%20manual
    • http://files.whitefishtherapy.com/uploads/1/3/0/9/130969424/fobenetuweg_sivumew_vozimaxonuxala.pdf
    • http://files.toharlev.com/uploads/1/3/2/8/132815343/95e82ff859421.pdf
    • http://files.kozynook.com/uploads/1/3/2/8/132815183/1609101.pdf
    • http://files.feedingmyohana.com/uploads/1/3/1/8/131871787/9e912e5fb41f.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/4993388352.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/kapuwuzigad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1072/files/kinibidodamoxof.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/37706313565.pdf
    • https://cdn.shopify.com/s/files/1/0439/0889/0792/files/jazozopanulomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/92118994730.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/70859952689.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/18067894282.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/xajam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4446/9927/files/bajiwu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/ziwavukoxenutotidifodoneg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8554/files/94557862467.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/
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/377063

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f97.bin
bb92300b63b61aae794087c5c89130f7bd40063d80fb84e2ada0d0cd824052ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 4936 bytes
font_01_sfnt_off00008040.bin
0a59a04a4bf514310a059e4898721a5b4e0fb16c7efef1083433ba880656e83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8040 11240 bytes

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