Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8c5022f0f8b270…

MALICIOUS

PDF

45.5 KB Created: 2020-08-04 23:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bcda9df716d7d9862e4b039fdfed3f7 SHA-1: 9b08a36d6ecc630722ebb46806042c2daf0d83f3 SHA-256: 5c8c5022f0f8b270ba9670907358efc122f4dabcb7d1e6e6ab3e8c3c3511bac4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=cracking+chinese+characters+pdf`. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

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=cracking+chinese+characters+pdf
    • http://files.perfumeriastore.com/uploads/1/3/1/4/131406885/7886132.pdf
    • http://files.minneapoliselks44.org/uploads/1/3/0/7/130776725/bolif.pdf
    • http://lologom.sleepingbunniesbabycoach.com/uploads/1/3/0/8/130874012/delofofex_fatutofisisunu.pdf
    • http://files.chinchenst.com/uploads/1/3/1/0/131071043/702920.pdf
    • http://files.signalmountaintravel.com/uploads/1/3/1/3/131379567/pefog-goporaz-mezedivuteledit-sirijekesowuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/88350188270.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/xofujobewuvuguxefutanariz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/77074226478.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3522/files/dawuxakibox.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/pofudusupuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/33588057326.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2622/files/applied_mathematics_1_hr_luthra.pdf
    • https://cdn.shopify.com/s/files/1/0438/3725/9938/files/3094168792.pdf
    • https://cdn.shopify.com/s/files/1/0431/1010/5237/files/blowfish_encryption_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/79161309694.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_off00006493.bin
358c10a901949923da9ba014a0d05e5cc935e8e03c748a90745899114363dc01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 3624 bytes
font_01_sfnt_off00007195.bin
192de8b4ad0e257a10462d9ce0d61f2774046e6e3d4fb95a95267c22adcb3c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7195 5352 bytes
font_02_sfnt_off000083c7.bin
36bde92343b37cc3fbecf9e19667f12a2ca14d9871be7e326eba14f66b43ebf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C7 10380 bytes

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