Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2d709546a1a560…

MALICIOUS

PDF

46.6 KB Created: 2020-08-15 06:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbb634abd9e19b2adf5a7df847f33286 SHA-1: 6c4a18a4fe0a6b631ebf5ef70f336995eb230b1e SHA-256: 5c2d709546a1a560cf652cc43b97d60cb739eeefbff8978cf95a67025761830f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that are part of a link farm, with one critical link pointing to known malicious redirector infrastructure. The document body text, though partially corrupted, suggests a lure related to an online application form, aligning with the 'Fake invoice / payment lure' heuristic. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=indiramma+housing+online+application+form
    • http://bijulij.wthilliard21.com/uploads/1/3/0/7/130775934/jadene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1562/7175/files/sowokivogi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4071/9516/files/gosukovosebobakuxapejuwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/tusabibajigedudewilad.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3047/files/fantasy_language_font.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/coordinating_conjunction_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/wesikenimobiga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/37822275915.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3290/3829/files/59292711544.pdf
    • https://cdn.shopify.com/s/files/1/0434/2844/6358/files/93433861840.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_off00007756.bin
575dc6389a2f0963d161a162c0cccbaf687142e19203d3d21365c4b81391aa93
pdf-font-stream PDF embedded font (sfnt) at offset 0x7756 5504 bytes
font_01_sfnt_off000089e0.bin
275530493fa250e1aab9682f0d5d341248bcd07f2b80fca35940d1c9a8fde1b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x89E0 10536 bytes