Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9599b51d734ae3…

MALICIOUS

PDF

42.6 KB Created: 2020-08-05 00:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974acf88866b157d438dfc9ee7778a8b SHA-1: 04e8a90dac2de04999b58b05203658df21e7e0e6 SHA-256: 7c9599b51d734ae3612a73fd6c4ac58db4332cb318af14c006add5aeef1a8659
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.cc', suggesting an attempt to direct users to malicious infrastructure. The document body, though heavily obfuscated, contains embedded URLs that appear to be part of a link farm strategy, likely for SEO poisoning or to host further malicious content. The presence of multiple PDF links and the ML classifier flagging it as malicious strongly indicate a malicious intent.

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.cc/pify?keyword=mass+incarceration+in+the+us+pdf
    • http://savirul.sydneymilitaryofficersspringball.com/uploads/1/3/0/7/130739379/diwuj.pdf
    • http://files.chimexim.com/uploads/1/3/2/6/132681378/9165408.pdf
    • http://files.simplesojourn.com/uploads/1/3/1/4/131438177/d6f49e20d.pdf
    • http://benov.autumnmoonhaiku.com/uploads/1/3/2/6/132681579/6006202.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/forensic_anthropology_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/53987618249.pdf
    • https://cdn.shopify.com/s/files/1/0438/2624/9885/files/akon_lonely_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/dorakudopubodazepeko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/6897385238.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6091/files/geburilodada.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/jofukuzan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8959/2473/files/37686009296.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/detakejiverawulibedel.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/95902465110.pdf
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/83114685882.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/tizeguxunokumamofewozizuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5912/5160/files/gubumulepifejenas.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_off000067eb.bin
2733fc738ef44f1827fedee85d0d08a9f29552757973c5eca1bd1db580e5dc2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EB 5216 bytes
font_01_sfnt_off000079b0.bin
320bac43011c86e446e1fc7f9c6a6f54e17cc649722c2e1310fb9646c1fa0552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B0 10504 bytes

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