Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c515a658e797643…

MALICIOUS

PDF

39.6 KB Created: 2020-08-04 00:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41803cde9ce7d3864c0579a8e7165028 SHA-1: 6a36537b57fb2f1ebb033cdb5f69ccf5e86ab600 SHA-256: 5c515a658e7976430d71ea8b38728aef9f5f68ec558b88c595f3ede14cb7c3b3
154 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, disguised as a diet-related PDF, which is a common lure for phishing or malware distribution. The heuristic firings indicate the PDF is designed to host a large number of external links, likely for SEO manipulation or to distribute further malicious content. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure.

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.ru/pify?keyword=diet+for+celiac+disease+pdf
    • http://files.tradeofgoodfood.com/uploads/1/3/1/4/131438423/2719833.pdf
    • http://files.paramountrec.com/uploads/1/3/0/7/130775827/wanuvawofi.pdf
    • http://files.decipheringtheuniverse.com/uploads/1/3/2/6/132696285/bupijasakebuzi-nunurawaposuzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5897/0280/files/fokebidosipumezepo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/60577239869.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3784/files/avi_to_dvd.pdf
    • https://cdn.shopify.com/s/files/1/0436/2544/7587/files/ftb_power_converter.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/44258644675.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/kakopanaxomugikuruki.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/pitorojugavagurilapuzon.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/51280733908.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/69198772039.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_off00005e8a.bin
cbe56e96085e09e01ce1e513b3baf7d5e7bc9918d52c3f04419b0d8bbafaed77
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8A 5148 bytes
font_01_sfnt_off00007026.bin
5a961256170e2a9fe8aabe9bdd4f6a6f697624a502f95ef6b66780330be434ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7026 9824 bytes