Malicious PDF — malware analysis report

Static analysis result for SHA-256 637ca01abb657039…

MALICIOUS

PDF

64.0 KB Created: 2020-08-10 06:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b04d0e93309eb8378befea7fd0677b3c SHA-1: 5294d85fcfbdfdc384578dae5aff55441ad54824 SHA-256: 637ca01abb65703975a871c22af93d01457dcac6a79ed19dc3c3a5f68a29bcd6
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one critical link identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to SEO and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicates malicious intent.

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=seo+101+learn+the+basics+of+search+engine+optimization+pdf
    • http://files.mediavisuals.net/uploads/1/3/0/7/130775245/4980268.pdf
    • http://files.invictahealthcare.net/uploads/1/3/2/7/132741385/1576775.pdf
    • http://files.kellerbassteam.com/uploads/1/3/0/9/130969573/a461e221921.pdf
    • http://files.thereservehtx.com/uploads/1/3/1/1/131163910/muxidu_tuzosofud_gilobodikafogiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/most_common_synonyms_and_antonyms.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/soroselomedid.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/palasar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5764/files/fabavabixemavuwepusine.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/93979409204.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/bowab.pdf
    • https://cdn.shopify.com/s/files/1/0440/5726/4280/files/76686529224.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/faa_form_8050-_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/56961538558.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/fatitaniwejepavegilig.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/72166785945.pdf
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/sajupe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac86.bin
cfdb252a48010a661f2fbd8c4bd3a9a0a30e53e4ebcab1b2b99358fbcc05aff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC86 5844 bytes
font_01_sfnt_off0000c030.bin
a97f91b84a9a2423ce1ef8a42701f817b604d64fbf9eb37eb9d070309772f037		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC030 10448 bytes
font_02_sfnt_off0000e3c0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 4324 bytes

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