Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e76b6c1fb9f5ca…

MALICIOUS

PDF

35.8 KB Created: 2020-08-01 13:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 364785f84100b23e6d1a08f157daef75 SHA-1: ade71573fc3551c5d69a2e5d99eae10bf6e5302a SHA-256: 98e76b6c1fb9f5cae604a739b5da2a61d6c971edf1bb64e9c1f04872e9314be4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.ru/pify?keyword=ohsaa+physical+form+2016-+17. The document body, though malformed, contains text suggesting it is a physical form, likely a lure. The ML classifier strongly supports the malicious verdict. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=ohsaa+physical+form+2016-+17
    • http://files.bloomintl.org/uploads/1/3/0/9/130969652/84490a6c73.pdf
    • http://files.labrottiecreations.com/uploads/1/3/1/4/131454505/3759211.pdf
    • http://files.struggleformodernturkey.com/uploads/1/3/1/4/131437593/meridedawaxubo-nukad-nosijoxubowi-muvigokemarowok.pdf
    • http://files.liftinggearhampshire.com/uploads/1/3/1/4/131408172/0a186931f94820.pdf
    • http://files.ltfdelmarq.com/uploads/1/3/2/6/132682171/fusugojaruzaseg.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/xatawasej.pdf
    • https://cdn.shopify.com/s/files/1/0435/9336/7710/files/39167843393.pdf
    • https://cdn.shopify.com/s/files/1/0431/8956/7650/files/24871365047.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/10492272009.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6966/files/vufaraf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/47688376616.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/kubokalin.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/zoniwavelofeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/word_limit_for_common_app_essay.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/muvaraketumimokowapafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76640573288.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/68972065659.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/76893542121.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_off00004ce5.bin
b47d523bab2a26ff8f2160bbeebbc400c99115861de6f17a9e23adc1253c4196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE5 5976 bytes
font_01_sfnt_off0000612a.bin
13ee49c1efa357cc531e232c7f7b0576841f4876ece74aba4409d18fea15e853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612A 9636 bytes

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