Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5104e09c2400ffb…

MALICIOUS

PDF

41.1 KB Created: 2020-10-07 19:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f9efc71daa741ca2e31cb7783bea4828 SHA-1: 62c15f12e5b3c252149582c2701ec52d451c17fc SHA-256: c5104e09c2400ffbfcbc54243bd0504c3065e3bc7b90399dfac188a60cc84766
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://cctraff.ru/strik?keyword=being+and+nothingness+sarah+richmond+pdf`. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign Shopify links but likely serve to obscure the malicious ones. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector link suggest an attempt to lead the user to a malicious site.

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://cctraff.ru/strik?keyword=being+and+nothingness+sarah+richmond+pdf In PDF document text
    • http://pafilewof.allan69.com/uploads/1/3/0/8/130874253/vifova-wifebeseb.pdfIn PDF document text
    • http://zusone.sparkfoundationinc.org/uploads/1/3/1/4/131483170/c95461a612f.pdfIn PDF document text
    • http://tubet.svgreatschools.org/uploads/1/3/1/4/131437454/f29e61ee0379c5c.pdfIn PDF document text
    • http://files.ramblingsofthepen.com/uploads/1/3/0/7/130740316/pokesisomewegup_jemoj_tevepaveni_limekufivekudel.pdfIn PDF document text
    • http://karumozob.travelswithlinda.org/uploads/1/3/2/8/132815213/8859806.pdfIn PDF document text
    • https://site-1038495.mozfiles.com/files/1038495/84910477401.pdfIn PDF document text
    • https://site-1038849.mozfiles.com/files/1038849/85071505759.pdfIn PDF document text
    • https://site-1043766.mozfiles.com/files/1043766/47890895186.pdfIn PDF document text
    • https://site-1036826.mozfiles.com/files/1036826/49737474290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6174/7105/files/31297804421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0321/5778/files/small_estate_affidavit_oregon_deschutes_county.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7952/0422/files/bemasoxulewerufakuwuxew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0723/4207/files/texto_argumentativo_ejemplo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0043/8689/files/demag_hoist_maintenance_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4787/3433/files/4432391228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/bosch_6kg_front_loader_washing_machine_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000620b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620B 5588 bytes
SHA-256: 4f35506ab1b7967dbce9e93691abc5632dd5d5da574500b62b10e6671bd23f06
font_01_sfnt_off000074e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E6 10088 bytes
SHA-256: 75657becd566be657cac0f60bb004779913033dc51b5d54cb9920cac7fca4a65

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