Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db3a2217ff37585…

MALICIOUS

PDF

40.6 KB Created: 2020-08-17 03:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31801d8bc525fec5ba0b23d9d28a6a52 SHA-1: 68ae28ed4c476f506a55f1650cd8d5ab7083022b SHA-256: 1db3a2217ff37585cd76c286cf873a06a1b9c524218a48c2624189cbc74e2a13
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to `https://ttraff.ru/pify?keyword=public+relation+interview+questions+and+answers`, suggesting a social engineering lure. The document also contains a large number of links to Shopify-hosted PDFs, likely part of a link farm to improve SEO for malicious content. No scripts were extracted, but the presence of the malicious URL and the link farm indicates 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.ru/pify?keyword=public+relation+interview+questions+and+answers
    • http://files.tritoncoral.com/uploads/1/3/1/4/131453543/aeb42f92b629d16.pdf
    • http://files.miraclespringsfarm.com/uploads/1/3/1/3/131398143/dc795e55302d.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/63893893986.pdf
    • https://cdn.shopify.com/s/files/1/0433/2024/6427/files/84621045086.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5134/files/social_security_disability_income_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/47610101821.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/sigiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4341/files/92069639715.pdf
    • https://cdn.shopify.com/s/files/1/0434/6164/0358/files/89538982974.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/32363895503.pdf
    • https://cdn.shopify.com/s/files/1/0451/4299/9194/files/vutalunabinuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/womekapisufibuzupiveje.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/65507188218.pdf
    • https://cdn.shopify.com/s/files/1/0434/3300/1126/files/zanabapolezabeke.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_off000060f9.bin
a47609506b9de666cc7ce0dd93f5440432985ca22636693aff2315a7aab8e642
pdf-font-stream PDF embedded font (sfnt) at offset 0x60F9 5352 bytes
font_01_sfnt_off00007339.bin
9af3c51dfc7951de9eecc0a2c5bf01f00d99ecf11f8da191b859d0094a60a5f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7339 10072 bytes