Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c95bd05076637d…

MALICIOUS

PDF

43.3 KB Created: 2020-09-13 14:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 365416c9a5291726c5be808766dcce46 SHA-1: 9dd0da21186f7449e09134f8ea1ef5e642e674dd SHA-256: a2c95bd05076637d405a6b809fbcd5a3df642b4e082e2b5a4ffc93fc71a986d4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier strongly flagged this PDF as malicious. The document body, while containing seemingly benign text, also includes a malicious URL, reinforcing the redirection attempt. The primary attack pattern involves luring the user to click on these links, which likely lead to further malicious content or exploits.

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.club/pify?keyword=radha+krishna+23+january+2020+written+update
    • http://gajof.ballicotech.com/uploads/1/3/2/7/132741555/f8788c.pdf
    • http://files.shaksygroup.com/uploads/1/3/1/3/131384113/9ec25e4.pdf
    • http://koteseta.icareunited.org/uploads/1/3/1/0/131070374/7263131.pdf
    • http://taras.wctherapygroup.com/uploads/1/3/2/6/132696056/tijozotolamawot-raniveruv-rupefewi.pdf
    • http://files.sustainableswansea.net/uploads/1/3/1/1/131164054/xiwaduvefubenasof.pdf
    • http://xagifegus.creativationevents.com/uploads/1/3/1/6/131606492/sekuzeponuxo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0388/5214/files/89580865017.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/mivajanegigupu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/joxetemonevabupur.pdf
    • https://cdn.shopify.com/s/files/1/0432/2803/7287/files/jupigibototujodosesogezig.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1425/files/veregodonerimodizifonawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9979/0243/files/11._4_meiosis_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/game_bullet_force_untuk_android.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_off00006a9a.bin
448f2b9037485c983df3c84af4f722dd6241e8acff7fff38b8942063693944dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9A 5792 bytes
font_01_sfnt_off00007e6c.bin
d94008902ba85fda356ce358e30277edf7b52c58f44cc31d7be23136e6e4e50c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6C 10048 bytes