Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb92eb9bed6881ec…

MALICIOUS

PDF

60.6 KB Created: 2020-10-07 17:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0cc4ddbc76c3a93cfa2e1ef8d1facd92 SHA-1: de4650340011c87f73e390e09ca0ba0740ba2e75 SHA-256: fb92eb9bed6881ec87420f6bf503af8e42a018be9ced80698a91a178be342879
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify and other domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, https://gettraff.ru/strik?keyword=vapor+compression+refrigeration+cycle+problems+and+solutions, indicating a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/strik?keyword=vapor+compression+refrigeration+cycle+problems+and+solutions In PDF document text
    • http://kofago.saeindiana.org/uploads/1/3/0/7/130775280/kulisunarigopi-bisasugu-zuremez.pdfIn PDF document text
    • http://zitim.vielka.com/uploads/1/3/0/9/130969402/c1390c952845790.pdfIn PDF document text
    • http://tutij.realearthnutrition.com/uploads/1/3/1/8/131859261/e66b2b.pdfIn PDF document text
    • http://files.downingcpa.com/uploads/1/3/1/4/131410007/7141258.pdfIn PDF document text
    • http://vitaj.barcall.ie/uploads/1/3/0/7/130740592/vepimenusepojowezur.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/1/0493/1869/0977/files/mastiff_lab_mix_dog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9542/5949/files/from_hell_alan_moore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9856/9381/files/printable_pokemon_cards_gx.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/jejot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50189307-3b10-4b21-83c9-7e3957e69c10/nuzodif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1841/9876/files/amana_radarange_microwave_not_heating.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/1134/2242/files/opi_pompeii_purple_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5415/6962/files/83000670801.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5926/0821/files/10587589996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8723/2166/files/faguvokibesosototopunivo.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_off0000ad21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD21 5684 bytes
SHA-256: fb028c4e0bef59057b114f676f3e448027c161010aa5bc49606af1568621c146
font_01_sfnt_off0000c068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC068 10860 bytes
SHA-256: faf2e42cfe5c3bbaee2e7608894e86b32754219339091a6b1e926b325661f76d

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