Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad73ed5db320d09…

MALICIOUS

PDF

52.5 KB Created: 2020-08-27 17:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e43e12c22ae16e8c1d36c6f2e68c81c SHA-1: 3118db8576f4459483ecbe567760256abeadf027 SHA-256: dad73ed5db320d091963651c209db75e9e28adbe334ade1927747844e9d3e691
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=oliver+collins+code+vein'. Additionally, a PDF link farm heuristic indicates the document is designed to host numerous external links. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the conclusion that the primary intent is to redirect users to potentially harmful content.

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.ru/pify?keyword=oliver+collins+code+vein
    • http://files.xcelbasketballprogram.com/uploads/1/3/1/3/131398515/9042194.pdf
    • http://resarewok.stanmorebowls.com/uploads/1/3/1/4/131483281/ca5584a.pdf
    • http://files.jaytaylor.store/uploads/1/3/1/4/131452783/2454183.pdf
    • http://files.staggerapparel.com/uploads/1/3/1/3/131380345/lilijim.pdf
    • https://cdn.shopify.com/s/files/1/0435/4755/8037/files/a_administrao_pblica_princpios_bsicos_da_administrao_pblica.pdf
    • https://cdn.shopify.com/s/files/1/0449/3259/5867/files/20108152071.pdf
    • https://cdn.shopify.com/s/files/1/0459/2356/5717/files/tour_guide_welcome_speech.pdf
    • https://cdn.shopify.com/s/files/1/0428/6427/9718/files/john_deere_z425.pdf
    • https://cdn.shopify.com/s/files/1/0448/4320/4765/files/tanzania_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/34215411234.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/jorur.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/precalculus_with_limits_ron_larson.pdf
    • https://cdn.shopify.com/s/files/1/0432/1030/9787/files/60023001365.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5263/files/99979586238.pdf
    • https://cdn.shopify.com/s/files/1/0435/3697/3983/files/90401659493.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000918e.bin
1e0d93b7203773a6cedc4d4bf17476a9e27324f847efd07903194ee4c9d2ac1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x918E 4812 bytes
font_01_sfnt_off0000a1f8.bin
3ebb97fd7692fbc9fce4a46525e0aeb74f636a5ba88ee323d93495a56f0b6676
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F8 10312 bytes