Malicious PDF — malware analysis report

Static analysis result for SHA-256 a005986e37cfc86c…

MALICIOUS

PDF

41.0 KB Created: 2020-08-22 17:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ce9fedfb542ecaa5335669ff9618e8 SHA-1: 4f60d9ecb8f6de96430535ae94aee8ff3fb762e3 SHA-256: a005986e37cfc86c73ded25505f84a7eb7bef00e9328ecf794c586df90837300
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic indicates a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the same worksheet title as the malicious URL, reinforcing the lure.

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=three+economic+systems+worksheet+answers
    • http://files.goyayas.com/uploads/1/3/2/7/132740541/1814312.pdf
    • http://files.healingrootshypnotherapy.com/uploads/1/3/1/0/131070973/8409289.pdf
    • http://kurepipi.kirstenpowell.com/uploads/1/3/1/4/131482962/4d0ed3613a11f.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/troybilt_5550_watt_generator.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/stock_market_trend_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7266/files/15071387557.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/anti_inflammatory_diet_pyramid.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/andrew_evans_911_cobra_777_twitter.pdf
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/3719286245.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/fixogepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/91808505970.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3516/files/deriromezejakuzipakekuxex.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/sazisumuzelupugota.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/xupavuxafokujik.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_off000062fc.bin
f51159e46836b50e66fb3b5ad32bdd198383cdc0189d66e271dc1dad4fc9c76b
pdf-font-stream PDF embedded font (sfnt) at offset 0x62FC 5212 bytes
font_01_sfnt_off00007499.bin
86e7abe1471e25bf8fb4255da3e29eb5341508258258600edaf870b663849947
pdf-font-stream PDF embedded font (sfnt) at offset 0x7499 10088 bytes