Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cebd9b72d4e7e37…

MALICIOUS

PDF

43.6 KB Created: 2020-08-17 00:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 257c00b959ab829853a054d1bbb81251 SHA-1: 2dd7c7007c83523ec56b2501a1c36bffda378222 SHA-256: 5cebd9b72d4e7e37b32ae54dc2803cd3748f12b76984b6f5f1c64db52fa52b9a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=printable+flyer+templates+free'. Another heuristic indicates a large number of external PDF links, suggesting a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links points to 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=printable+flyer+templates+free
    • http://files.kittywatchjapan.com/uploads/1/3/2/7/132740633/154959cc2d80b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/antiepileptic_drugs_a_clinician_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3022/files/hyundai_elantra_2020_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/dj_sagar_cg_mix_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/48861879384.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/35668973931.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/safety_equipment_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4815/files/rirunujalenumul.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/numeros_primos_y_compuestos_6_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/jufogowaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/bejufawilobipamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/80062546124.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_off00005fdb.bin
48d204a68608c8a14f56f52e84881c48cd096bdaefbe864c3f1927098edec339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDB 4968 bytes
font_01_sfnt_off00007096.bin
59c3101a70b711c266ae3d889eae355b94401b0a350b3604a43f0c53b8e65438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7096 10260 bytes
font_02_sfnt_off000093b8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93B8 4324 bytes

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