Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b551e05d4fb11b1…

MALICIOUS

PDF

40.3 KB Created: 2020-08-14 19:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4adc2c925a6e805e6634b1add0398ed SHA-1: b1ed2d9a819dd0635c71e64119e1e73b01f51b16 SHA-256: 5b551e05d4fb11b1287126a617d7db671e91b66b72f0dd3c1214a3e144e603f0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that appear to be part of an SEO link farm or a phishing attempt to direct users to potentially harmful sites.

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=webb%20cylinder%20mower%20parts%20manual
    • http://files.ijwiryabategereje.com/uploads/1/3/1/3/131380627/metagol_wubozutatavad.pdf
    • http://files.ecmtrust.org/uploads/1/3/1/4/131406344/watibapimeposojes.pdf
    • http://files.waynerichards.org/uploads/1/3/0/7/130738841/fasugavuf_nopimamalexika.pdf
    • http://vifixazu.robertomaldonado.com/uploads/1/3/0/8/130814328/d15f39e1419184e.pdf
    • http://mosotope.fletcherscreek.com/uploads/1/3/2/6/132695615/7925828.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9713/6030/files/biblia_de_estudio_thompson.pdf
    • https://cdn.shopify.com/s/files/1/0437/0667/9447/files/dejegifigoziwonod.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/spanish_possessive_adjectives_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/0243/6518/files/access_consciousness_clearings.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/zojedusafasuseg.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/xatidaturaratexakolub.pdf
    • https://cdn.shopify.com/s/files/1/0429/6222/3263/files/jifegusojutegoxebolesi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/lisimalobutawerajiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/6600/7445/files/warex.pdf
    • https://cdn.shopify.com/s/files/1/0446/6225/9865/files/jinalesajewunagibalida.pdf
    • https://cdn.shopify.com/s/files/1/0436/2718/4281/files/c_as2_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/25483452805.pdf
    • https://cdn.shopify.com/s/files/1/0429/8031/1203/files/castrol_crb_turbomax_15w40.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/58284990697.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/lovawedel.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_off00005e3d.bin
517e03efa34dad7dbf430a936b16aee083945327657987e11a05188322e9c21e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3D 5564 bytes
font_01_sfnt_off00007121.bin
30bf994c1e73243ca88b3e53a9e9aaaa8920e75159ec9e4085104c02fb45c870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 10308 bytes

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