Malicious PDF — malware analysis report

Static analysis result for SHA-256 60dd439ee01e9469…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 04:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2d85618f17a81181f9d6fbb33866491 SHA-1: 22b9561dd9ccd2754c03085d7d8f2b802a57b06b SHA-256: 60dd439ee01e9469efed67192e8b8c15d13beb10ba6cd7090d69f1c37029b9e3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to funnel users towards malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of the malicious redirector URL is the primary indicator of compromise.

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/wb?keyword=management%20books%202018%20pdf
    • http://files.interactivefrench.hk/uploads/1/3/0/7/130740222/7569832.pdf
    • http://files.swanseaspeechandlanguage.co.uk/uploads/1/3/1/0/131071067/7304079.pdf
    • http://files.hypnoticsolutions.org.uk/uploads/1/3/1/8/131856318/b5cb52b13d4b472.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6945/7055/files/mujekejinenejuxapiwuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/38836908154.pdf
    • https://cdn.shopify.com/s/files/1/0431/2766/8890/files/5296340492.pdf
    • https://cdn.shopify.com/s/files/1/0434/4132/4184/files/nortel_networks_phone_manual_t7316e.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/midugizajifug.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/cbse_class_9_english_literature_reader_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1562/files/bogavefasepu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/adaptability_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/6707490079.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/ariana_grande_christmas_album.pdf
    • https://cdn.shopify.com/s/files/1/0449/2450/2171/files/paul_wall_gril.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/fulazuzopelizitodasaku.pdf
    • https://cdn.shopify.com/s/files/1/0452/4248/2849/files/zabonufomiwosafikejij.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_off0000620d.bin
e8fa0d8a1432b777c58256ad045d6483924a58226f8c8c8c64bef08e8c1e3bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620D 5960 bytes
font_01_sfnt_off00007650.bin
fca53faa10fceef17e0de65d288ba4d9055d7e75c9ee6e8d7b1d6c42e71df789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7650 10616 bytes

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