Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b83072fa030715a…

MALICIOUS

PDF

43.1 KB Created: 2020-10-08 05:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7eb47e1730b500d471ad23144148056 SHA-1: d44199703924720138a9f2317a69fb34a08c342a SHA-256: 0b83072fa030715a28a932a7823011050d70ad067deea742c100d2e24a1cfd57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://gettraff.ru/pify?keyword=bank+of+america+notary+public+nyc`. Additionally, it exhibits characteristics of a PDF link farm, hosting numerous other PDF files, which is often used for SEO manipulation or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=bank+of+america+notary+public+nyc In PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/xuwidelabesineberag.pdfIn PDF document text
    • https://site-1042598.mozfiles.com/files/1042598/mosituvumavogukif.pdfIn PDF document text
    • https://site-1041926.mozfiles.com/files/1041926/sijobanitew.pdfIn PDF document text
    • http://vexomasuw.sanabriaphotography.com/uploads/1/3/2/8/132814930/6844695.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/1/0435/2511/1967/files/rejete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5470/3004/files/football_manager_2015_skin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/vuridasivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3485/9930/files/franchise_payments_network_winter_garden_fl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9903/6579/files/baby_cache_crib_screws.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4302/0183/files/xijutelonixazidevexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0198/1339/files/jusedutula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6653/0721/files/78628411547.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5619/6515/files/walgreens_blood_pressure_cuff_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000608a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608A 5340 bytes
SHA-256: 0224aa1b7a44ccfa2af0ec2ed475cc23a18d28a46580b63abbb85b14e3045407
font_01_sfnt_off000072a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72A6 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00007b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B33 10580 bytes
SHA-256: 5033e94a7507d5268baf6acc8d350ab1bf499f62f115747858aba34d50c76b28

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