Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d69ffe000b71b5b…

MALICIOUS

PDF

56.5 KB Created: 2020-08-17 12:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2203123555a01d2d89675a61e5b3a452 SHA-1: b50f16d3e44e0bd40892895138da0c1ee8ce8712 SHA-256: 4d69ffe000b71b5b72c4e45ce1d5e30e19c715e79208c38478dcd81195743290
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to `https://ttraff.com/pify?keyword=dryer+sheet+hacks`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to "dryer sheet hacks". The presence of numerous other links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. 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://ttraff.com/pify?keyword=dryer+sheet+hacks
    • http://labol.anengineersblog.org/uploads/1/3/1/4/131438379/7604282.pdf
    • http://files.birthrightlake.org/uploads/1/3/1/8/131871864/dutapo.pdf
    • http://files.poetriinmotion.com/uploads/1/3/1/3/131379594/4917021.pdf
    • https://cdn.shopify.com/s/files/1/0435/1551/0938/files/budatuletivubuxudor.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8241/files/suxovotukefalenulitemokil.pdf
    • https://cdn.shopify.com/s/files/1/0429/8339/1395/files/23555020494.pdf
    • https://cdn.shopify.com/s/files/1/0452/8957/0466/files/26906088452.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/ethical_altruism.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/lavosixo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/84091760251.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/lilegekogigodofiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1303/files/bhrashtachar_information_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/67753815097.pdf
    • https://cdn.shopify.com/s/files/1/0436/9953/6040/files/19464414305.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/golamevejuwivisufaw.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_off000095a7.bin
f40101688f1038d7171587d1f581b8bce730ad4b01fa4d63be631ed12c22e4e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x95A7 5020 bytes
font_01_sfnt_off0000a6bc.bin
082cecdacc647c8f6f48f5c2d41dd8e76426d58a97f5adaa574135a16d086453
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6BC 15300 bytes