Malicious PDF — malware analysis report

Static analysis result for SHA-256 76791ede3edf77a2…

MALICIOUS

PDF

44.0 KB Created: 2020-07-31 13:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6ada38224d5695e825e576835540daf SHA-1: 31160f8596fdfd831dcc5e5341fa2a4e18bab3c9 SHA-256: 76791ede3edf77a2dad1773f58d74c43cec6268cbca1751a87ea3133b0d07794
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs, particularly the one pointing to 'ttraff.cc', are indicative of a phishing or redirection attempt.

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.cc/pify?keyword=corso+italiano+a1+pdf
    • http://files.ucmagnolia.com/uploads/1/3/0/8/130813694/porejafipel-jeludisanunosik-junukinuxuk-zefav.pdf
    • http://files.j2terrarium.com/uploads/1/3/0/7/130775471/bijotabobeso_sopadaz_zabadekefulizo.pdf
    • http://files.johnsonhoopbuildings.com/uploads/1/3/0/8/130814205/9245474.pdf
    • http://files.empachernorthamerica.com/uploads/1/3/2/6/132681560/1543305.pdf
    • http://files.limitlessptny.com/uploads/1/3/0/7/130775565/mipasuzo-kuzalumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/80385597013.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7702/files/jijifafitufunaninuwovavuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/34321316008.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/pokusik.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/8023292967.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/podixedabilixekowolujo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/78013029153.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/wiriwamalakis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/45220972707.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/romiket.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/nuxisorov.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/lugutadubajonilesuloxuzu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/55855700219.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/31022254264.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_off00006e6d.bin
67ddd1387cf448e893cc176d2ba50552c69109d7ce8c1305f6f70df2e7d5c3ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6D 4780 bytes
font_01_sfnt_off00007eb3.bin
decd8037193e100ec21bfd030d85ffeba36423f872eb2ac5e8bc2db2644c6ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB3 10932 bytes

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