Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65117927bc2da36…

MALICIOUS

PDF

43.1 KB Created: 2020-08-12 11:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1be98a81a8716b6e7d719c3de3f55954 SHA-1: 6fc50821c941115d1e5f14a8b914b8f01686790e SHA-256: e65117927bc2da36ba5b716d227d98ff925070b2ff9a0c315e582cf83f3a7e42
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, ttraff.com, which is known to host malicious content. The document body also contains numerous links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly indicates maliciousness. The primary attack pattern involves luring users to click a malicious link disguised as educational material.

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=ap+psychology+practice+test+pdf
    • http://files.zoom8-austria.com/uploads/1/3/1/4/131437976/miwilegirasowed_puzuze_duzikaponabul_gelefopiror.pdf
    • http://files.hilltopct.com/uploads/1/3/1/4/131455621/7504bc68cb69479.pdf
    • http://files.cvwdi.org/uploads/1/3/1/6/131606330/pagasa-nigerezumavi-zifenopaje.pdf
    • http://gisos.spacegianthelmets.com/uploads/1/3/1/4/131407815/gilasu.pdf
    • http://files.studiosix.biz/uploads/1/3/2/6/132681164/3e0cf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/wesapabitozej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7809/0901/files/15747230066.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/playboy_magazine_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/9127/0563/files/cancer_immunotherapy_vaccines.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/vijerideda.pdf
    • https://cdn.shopify.com/s/files/1/0431/1010/5237/files/blowfish_encryption_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/88484767505.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4682/files/tupevojuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/libake.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/dijaxorixakuzirow.pdf
    • https://cdn.shopify.com/s/files/1/0429/6582/7747/files/vokekasuvibenoduvebudigu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0130/6526/files/dialects_of_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.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_off00006951.bin
873719841adc1c9006621c0d4a76d5a3bebad1177c2ea860113871d8552856e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6951 5508 bytes
font_01_sfnt_off00007c08.bin
dd4629b757b15389cc4c05d16fee5e04dcb0f264f92559d12ce4a84a3096ec0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C08 10332 bytes

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