Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a87e59be748d42…

MALICIOUS

PDF

51.3 KB Created: 2020-08-03 09:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbbc93317b77700192c77d5aa5aa510c SHA-1: 4f8fd9dd1a3aa6f8d0e80b53667ee69bc3fdde87 SHA-256: 60a87e59be748d42665e820ed3b61c333b561b07bea1e8da4dc2c4775a36efa0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=synapse+roblox+gatorguy'. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that aligns with the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=synapse+roblox+gatorguy
    • http://files.politicaltoons.net/uploads/1/3/1/4/131483009/gofixixivojo_bomusuw.pdf
    • http://files.thecovenantschristandyou.com/uploads/1/3/1/3/131379434/94345039.pdf
    • http://files.merrifieldseminar.com/uploads/1/3/2/7/132710655/7749287.pdf
    • http://files.spotlightseniorservicesnorthernarizona.com/uploads/1/3/1/3/131380171/gonokuda.pdf
    • http://files.acarpetcleaningservices.com/uploads/1/3/0/7/130776204/d57b19b722f2d24.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/pimiguzuli.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/82960973946.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2994/files/88017480755.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/92665684325.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/lipurekilobovobisepet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/jowedoniwagup.pdf
    • https://cdn.shopify.com/s/files/1/0435/4677/1607/files/mululewo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/51182294734.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/babape.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007de0.bin
8ec2c1e46078a05b61fa768af93aafa0fe254d4dddda9eee3460a9d37e4aa086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE0 5400 bytes
font_01_sfnt_off00009054.bin
9d5c2775208471420bd07e07fbbfd9080ec6a89ee9cea25cf924b46cb5228f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9054 15132 bytes

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