Malicious PDF — malware analysis report

Static analysis result for SHA-256 18588b5d2868c92a…

MALICIOUS

PDF

49.4 KB Created: 2020-08-25 08:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1269e24f6a06aea70e5bb40e9e7612f2 SHA-1: 7a373951e34baa4cea1fbf12c06f0eec6a7640a0 SHA-256: 18588b5d2868c92a6c923cea9385f510505e0a04041d80478a44175f3e1afae2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic identifying a redirector link to 'ttraff.com'. This suggests an attempt to lure users to malicious content, potentially for phishing or malware distribution. The presence of a large number of external PDF links further supports a link farm or SEO abuse tactic. No scripts were extracted, and the document body is heavily obfuscated, but the primary malicious intent appears to be URL redirection.

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=angular+form+pristine+dirty
    • http://files.theroanokerestaurant.com/uploads/1/3/1/3/131380445/padami.pdf
    • http://tejuxip.edrenzi.com/uploads/1/3/1/8/131857114/kodolabaxizuki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/87351201954.pdf
    • https://cdn.shopify.com/s/files/1/0451/8042/0247/files/55250673820.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/35641191961.pdf
    • https://cdn.shopify.com/s/files/1/0439/4477/1739/files/early_childhood_education_journal.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/kunduz_province_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/3851/4071/files/balancing_chemical_equations_worksheet_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/wivoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/35729018578.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/60809016606.pdf
    • https://cdn.shopify.com/s/files/1/0435/8979/5998/files/20870393885.pdf
    • https://cdn.shopify.com/s/files/1/0429/8522/6393/files/temaruvunezigenilirozi.pdf
    • https://cdn.shopify.com/s/files/1/0461/4271/8115/files/63295901870.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_off0000679a.bin
2d01962beda87ac16f209a02ea0a6d4e594e53ce63e66390a66fb2671495294d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679A 5452 bytes
font_01_sfnt_off00007a14.bin
800b3f4bb0b69a2b9df867b5b78b74591b0a007804f09584c08ddaf9515c7b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A14 3368 bytes
font_02_sfnt_off000087aa.bin
d8f22327994aa71a59df064d37f33d425cdfcbb3123ea85cfeb881ed70bcda6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87AA 14812 bytes

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