Malicious PDF — malware analysis report

Static analysis result for SHA-256 091efa7fe7d90122…

MALICIOUS

PDF

34.6 KB Created: 2020-08-24 13:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50cde426d7fa2f136939bdb49bf5daac SHA-1: 1286a984bc905caef6a533e5233354ab4787150f SHA-256: 091efa7fe7d90122957e9022b2763cceaa339ce07ea1a56a00a663a2b6814e2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=oil+filter+cross+reference+sheet', is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'oil filter cross reference sheet'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious redirector. 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.ru/pify?keyword=oil+filter+cross+reference+sheet
    • http://files.urbanmuttretreat.com/uploads/1/3/0/7/130776619/xufali-lojagita-padixa.pdf
    • http://files.lakejordanhobo.org/uploads/1/3/1/1/131164132/garijas_pobazavabopu_neras_jomajin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/9814/9798/files/tetuse.pdf
    • https://cdn.shopify.com/s/files/1/0432/0267/4845/files/60406822240.pdf
    • https://cdn.shopify.com/s/files/1/0448/0968/3106/files/bsp_internal_thread_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6733015585.pdf
    • https://cdn.shopify.com/s/files/1/0430/0960/5791/files/jakawurinesenul.pdf
    • https://cdn.shopify.com/s/files/1/0437/2457/0792/files/namalife.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/vafijedusurelod.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/65104287310.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/bonemewe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0455/9519/files/acr_form_for_teachers_in_hp.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/13619832270.pdf
    • https://cdn.shopify.com/s/files/1/0450/4561/2694/files/las_ciencias_formales.pdf
    • https://cdn.shopify.com/s/files/1/0430/4266/8698/files/80412471166.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2261/files/27468601962.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9499/files/gegirewowudupotepo.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_off00004a78.bin
a1c1ce1d3ed27b71421717298d9c110dc3d5ea3c511463c87e0beb9265f6d0a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A78 4788 bytes
font_01_sfnt_off00005ab6.bin
b3eb331828b8bea5123f80426a13a2e2c7e272813b0a5dfe6f72704d20a0737b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB6 10204 bytes

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