Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ceb23dfed33e7a…

MALICIOUS

PDF

40.8 KB Created: 2020-08-13 23:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25b62ba543dc77439916791f8ffbc5b0 SHA-1: 30d5627aa7411899b9b3a95017070fd7ac52fe7f SHA-256: 36ceb23dfed33e7a63c200b3d8d2f631f147767a14e39693da3b6fe64f175762
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=excel+vba+worksheetfunction.+match+range'. The document body, though heavily obfuscated, also contains this URL and other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to lead the user to a malicious site or download further malware.

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.ru/pify?keyword=excel+vba+worksheetfunction.+match+range
    • http://gulumud.bath-nh.org/uploads/1/3/1/4/131453329/164095.pdf
    • http://files.skincarebyangela.org/uploads/1/3/1/6/131636678/gebowatobaj-beveganeg-tivupubodaf-jawufagiril.pdf
    • http://files.sherpapackers.com/uploads/1/3/2/7/132741029/kusovuvesuzimev_sinodapuv_tuvazari.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/tukowilufewapip.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/fezofafidenibijuwiger.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/petaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/8823/0053/files/bonus_act_amendment_2020_notification.pdf
    • https://cdn.shopify.com/s/files/1/0431/2524/4053/files/yeh_jawaani_hai_deewani_cast.pdf
    • https://cdn.shopify.com/s/files/1/0430/0711/5423/files/wavaburekixesoduv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/sidovuvikamidugizitav.pdf
    • https://cdn.shopify.com/s/files/1/0448/5827/8050/files/area_model_multiplication_worksheets_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mavadusuwavofemikedoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/bekigelezuzuluzoxig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6417/2445/files/89092505123.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_off00005ed0.bin
c1d2c3584af88383902b2c12591640626d21ce44bf16382fd51640678f5e0641
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED0 5708 bytes
font_01_sfnt_off0000722b.bin
e6a0a50b0f44b55ffb846077773ccce2c0922cdebbb638640dd300a6b95a85da
pdf-font-stream PDF embedded font (sfnt) at offset 0x722B 10564 bytes