Malicious PDF — malware analysis report

Static analysis result for SHA-256 6349124ea459cd81…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 02:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203dbfb2f6c5ddd574ded63a23a58b82 SHA-1: 6ea22c30ab2da561f041b9dbb1ee9d3bee5869d5 SHA-256: 6349124ea459cd81bd1fdc0eacb35de113379f19d35c6670613f6600115bf265
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=problem+in+speaking+english+fluently+pdf', suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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=problem+in+speaking+english+fluently+pdf
    • http://files.ohiobudokan.org/uploads/1/3/2/6/132695851/8065149.pdf
    • http://files.creatingmedia.org/uploads/1/3/1/3/131379724/3059560.pdf
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/12877021685.pdf
    • https://cdn.shopify.com/s/files/1/0440/0925/9158/files/63049572260.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/54974596832.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6082/files/tikulimuxixakujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2022/2627/files/simple_past_exercises_all_things_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29480145432.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/darth_plagueis_online.pdf
    • https://cdn.shopify.com/s/files/1/0438/9660/2779/files/40115154493.pdf
    • https://cdn.shopify.com/s/files/1/0435/5499/6383/files/examples_of_alkanes.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/fovepofabajefe.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7347/files/maximum_depth_of_binary_tree.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/bataille_de_verdun.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_off00006182.bin
f56e86b581c82f07c9fc44dcccb93e70dac69688799342786ba2123895ab9776
pdf-font-stream PDF embedded font (sfnt) at offset 0x6182 5760 bytes
font_01_sfnt_off000074f0.bin
ac194537152e18239b35f76f6038f3a513548a2d0414c621d0d334be625f8a19
pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 9784 bytes