Malicious PDF — malware analysis report

Static analysis result for SHA-256 549e835b8dfe6191…

MALICIOUS

PDF

40.1 KB Created: 2020-08-19 22:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3998fe500320d5219407f11bce038843 SHA-1: 6bf2cf3987f7b8db8ba65eea04b83733cf82420a SHA-256: 549e835b8dfe6191f241f6b5f8561560c22a8e6ad585f6658b702a94d65f559d
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain (ttraff.com), disguised as an ESL worksheet. This indicates a phishing or social engineering attempt to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload execution.

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=parts+of+speech+esl+worksheet+pdf
    • http://duzaxadad.seandevare.com/uploads/1/3/0/7/130775934/sesex.pdf
    • http://simona.lawnbowlsnovascotia.com/uploads/1/3/1/4/131483281/fobureledukawek.pdf
    • http://files.wickenburgchristianacademy.org/uploads/1/3/1/4/131454262/4959875.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/keihin_carburetor_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/bikadatuxujije.pdf
    • https://cdn.shopify.com/s/files/1/0439/9667/6254/files/awake_fiberoptic_intubation.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/73682124661.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/xavofukimale.pdf
    • https://cdn.shopify.com/s/files/1/0437/7991/5937/files/cement_clinker_manufacturing_process.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1155/files/bapupipabinimunok.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3186/files/bakamitilifeta.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7274/files/74480313409.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/stanford_encyclopedia_of_philosophy_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9834/files/29466078179.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_off00005f1f.bin
6372ac424abe233c3224f4348b1d279a584274a57ac35e943670c0f7b9c036b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1F 5400 bytes
font_01_sfnt_off00007187.bin
7eceb90a7dbb6de9ffc4078bdae922a07928e1e8dbe966976c5e0f400a3bacee
pdf-font-stream PDF embedded font (sfnt) at offset 0x7187 10076 bytes