Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a725d72a95b8349…

MALICIOUS

PDF

46.3 KB Created: 2020-08-14 18:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31d60fca9368415e1cbb7f2fa8592a6 SHA-1: 171c4a262cf9f3dd41975d1c8d9b3925292c899d SHA-256: 5a725d72a95b83495a285aef7be338c941ba303ddb1f418f7532656b2c172e10
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. It also contains a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of these links points to a likely phishing or malware distribution 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.cc/pify?keyword=cultural+assimilation+pdf
    • http://files.brendawehle.com/uploads/1/3/0/7/130738859/zilabilinevi_burububefam.pdf
    • http://files.plan-brian.com/uploads/1/3/2/7/132740997/0f35e5.pdf
    • http://files.nebuchadnezar.com/uploads/1/3/0/9/130969712/7331144.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/76818436005.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/66345420620.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/bogawonazawowuxudev.pdf
    • https://cdn.shopify.com/s/files/1/0435/3350/0565/files/badugupobonot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0973/5845/files/zadabejejijazune.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/annamayya_movie_songs_lyrics_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4454/files/menisipuditalono.pdf
    • https://cdn.shopify.com/s/files/1/0440/0090/3318/files/how_to_convert_apple_book_into.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/74887447642.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/mufefojojolazipudela.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b6a.bin
d8881fb17db9d4350341a8caa97d7cc9dc7710f48938d2bbbb72a4398fe50125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6A 4976 bytes
font_01_sfnt_off00007c2f.bin
15bfcee517fb065321980885dc0d1c472674f2a8a953eaa013614260094d4d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2F 9924 bytes
font_02_sfnt_off00009e13.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E13 4324 bytes

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