Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c549d93f0d4913…

MALICIOUS

PDF

46.3 KB Created: 2020-08-03 12:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320b5ecce2d73a297c7e0f5972539a12 SHA-1: 3013905a32c8d4940ab6342ee914e77f23d16513 SHA-256: a9c549d93f0d4913424624104daf79ddbfd19836553d46baf095fccfe7aa1607
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The primary malicious link is https://ttraff.cc/pify?keyword=things+i+wish+i+knew+before+i+got+married+pdf, which is likely used to redirect users to further malicious content. The document body itself contains garbled text but also includes the malicious URL, suggesting a lure or redirection mechanism.

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=things+i+wish+i+knew+before+i+got+married+pdf
    • http://files.foodloveblog.com/uploads/1/3/1/3/131380868/vosirijofa.pdf
    • http://files.giorgioceccottidesign.com/uploads/1/3/0/8/130813413/nubazolufox-pewasovujum-wonok-milojekevuzaj.pdf
    • http://files.freehomehealthaidetraining.com/uploads/1/3/0/9/130969498/7680844.pdf
    • http://files.oceanlink-inc.com/uploads/1/3/0/7/130739850/4286650.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/13429766154.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/93114587625.pdf
    • https://cdn.shopify.com/s/files/1/0428/4134/2108/files/93269371194.pdf
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/zujalegagabogak.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8138/files/16226377724.pdf
    • https://cdn.shopify.com/s/files/1/0428/9321/3852/files/bagiwusoporibelanav.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/55020526810.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0434/8605/2504/files/30843692786.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/nugazijaduwemuwumu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/91779881154.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007547.bin
41a724572f01cd30bcfb4cedbc13058d415a9e292a84e6d7b84c2cd91b6202b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7547 5668 bytes
font_01_sfnt_off00008876.bin
16a7f4c2ed444c5ebcb605502daaa85c9809c3d76f5f0a837a6dc79a278c441d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8876 10388 bytes