Malicious PDF — malware analysis report

Static analysis result for SHA-256 1813cb6f8535d2a3…

MALICIOUS

PDF

33.6 KB Created: 2020-08-12 18:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e953346f8d43e8f9c4b12db478a27f0c SHA-1: c78f5e6d3078ac58cbf6ef3ab13232f33583be85 SHA-256: 1813cb6f8535d2a3f8a5e1806becbebc22acad2b5e962dbb96d41865a3df14ed
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though partially corrupted, includes text suggesting it is an 'affidavit' and contains the malicious URL, likely intended to deceive the user into clicking it. The presence of many external PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious 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.com/pify?keyword=anti+ragging+affidavit+by+student+pdf
    • http://files.shonwilson.com/uploads/1/3/0/7/130776591/gidumubexavabej_lariv_rodijuguzusa.pdf
    • http://files.mediaactive.org/uploads/1/3/0/8/130873791/jatopamatapezovipo.pdf
    • http://files.marketmovesmatt.com/uploads/1/3/0/8/130874629/nuvigure-bufagejiv.pdf
    • http://files.planomidwifery.com/uploads/1/3/0/7/130739719/834170.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2934473971.pdf
    • https://cdn.shopify.com/s/files/1/0438/4784/4000/files/doguruguda.pdf
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/piwewifovuwexijejafetol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/61112215647.pdf
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/butterfree_gen_3_learnset.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/bevujij.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/zozoxiputadogowegipive.pdf
    • https://cdn.shopify.com/s/files/1/0427/4873/9740/files/self_mastery_through_conscious_autosuggestion.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9089/files/i_believe_i_can_fly_chords.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_off00004417.bin
5eac268a527796d37c8360376ec73106839878ef110a4733cbeda8f89681108d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4417 5468 bytes
font_01_sfnt_off000056c1.bin
cef05c9e961886e7eb56c3fe7b426fbb081dd0a52a66c567981906094b593f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x56C1 9880 bytes