Malicious PDF — malware analysis report

Static analysis result for SHA-256 6403c35456bccc30…

MALICIOUS

PDF

42.9 KB Created: 2020-08-18 19:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a76a12605a5b600f102b9666234abf82 SHA-1: 32326807504c81c72b49bdcb627fb7f0dc730dd4 SHA-256: 6403c35456bccc30a02b31897d64492f2334534e447f21eca17b28a3c00b481e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. No scripts were extracted, but the presence of the malicious redirector and the link farm pattern strongly suggest an attempt to direct users to harmful content.

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.cc/pify?keyword=belleau+wood+tour+guides
    • http://gexuz.stanheptinstall.com/uploads/1/3/0/7/130739204/bitan.pdf
    • http://rupar.centurymusic.ca/uploads/1/3/1/6/131637814/bezafexewibot_lovukovexawabem_zupijobelilibej.pdf
    • http://files.okcstairclimb.com/uploads/1/3/2/7/132740249/02b23ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/mexogopagonum.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8822/files/diwuwenakaxise.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/edit_text_in_bluebeam_revu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0830/8886/files/canon_ae1_program_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/91394957577.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/zaratustra_nietzsche_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0437/8260/2913/files/alcohol_units_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/poe_incandescent_heart.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/31768658097.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/lijoduxabovu.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_off000069e2.bin
9dee9c37924458701767c7cdfa365f885b94742bd2734fa791843ee9651d38c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E2 5132 bytes
font_01_sfnt_off00007b73.bin
a07d741a1d9fea0fa67602c1d9311e9bb2f0a7d979296b9bfe369ca3be806feb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B73 10304 bytes