Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7c8b12415e0f71…

MALICIOUS

PDF

61.6 KB Created: 2020-08-19 20:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c7149af3f25eb1ccb1a656c7525a69 SHA-1: f9929afaa0a0865330192e1b345cc49da8ec14f2 SHA-256: 5f7c8b12415e0f7193bf347f0bb949b75530dff8928daf32d465c3ef8876e054
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which are designed to appear as legitimate PDF files hosted on Shopify. However, one of the primary links, 'https://ttraff.ru/pify?keyword=appserv++windows+xp', is identified as a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign, aiming to direct users to malicious infrastructure. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate a phishing or redirection attack.

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/pify?keyword=appserv++windows+xp
    • http://files.thetruenerdcompany.com/uploads/1/3/2/6/132681033/bowis.pdf
    • http://zawifup.jeriowa.com/uploads/1/3/1/4/131406893/2d8ba018.pdf
    • http://files.perryperkcoffee.com/uploads/1/3/0/9/130969308/medodoxi.pdf
    • http://files.somesugarwithspice.com/uploads/1/3/1/4/131453990/jidegotaxubegot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1987/9068/files/medaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4013/files/wusokopajizebenegu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3448/2587/files/phytophthora_parasitica.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/79219513008.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/lavaxixelovemowokewovituf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/32686550022.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/givaritapegogenojaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/27540211285.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/19578859392.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0296/files/belefipowogixomonaluso.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/gazodomareralemudoba.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/jusilemerunixefov.pdf
    • https://cdn.shopify.com/s/files/1/0440/4248/5910/files/polygons_angles_and_parallel_lines_worksheet.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_off0000aa29.bin
0f4041d90530c474d4f2af75cf648d639a7aa9c8c84135cc15a4b24fba5dec6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA29 4920 bytes
font_01_sfnt_off0000bb0d.bin
d25134bbbbf196f01958ed5d8ba5a91df6e4af5e3374b2a82ef23485e5ca03c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0D 15000 bytes

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