Malicious PDF — malware analysis report

Static analysis result for SHA-256 26da88ebd186c1b8…

MALICIOUS

PDF

59.3 KB Created: 2020-08-10 15:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd9833ba639c5c04a2b2ecb784a47aad SHA-1: 9ddd31fc6bb180ccd5ac9d6cffae3121ad686f92 SHA-256: 26da88ebd186c1b8d41f115d6ba88b56e2771959d0970b45c3f445e1a8583101
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'agricultural marketing articles pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning.

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=agricultural+marketing+articles+pdf
    • http://files.mcncgop.org/uploads/1/3/1/8/131860787/xifazuzipab.pdf
    • http://files.thriftersfieldguide.com/uploads/1/3/1/4/131408798/dajigol_fojivaj_fimavu.pdf
    • http://files.daniellebodine.com/uploads/1/3/2/7/132710763/8800892.pdf
    • http://files.thedaimlerxjcollection.com/uploads/1/3/1/6/131637224/2086362.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/76499453773.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/2138020212.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/christmas_carols_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/bapavezab.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/94925729981.pdf
    • https://cdn.shopify.com/s/files/1/0432/6670/3516/files/niborupewifezisow.pdf
    • https://cdn.shopify.com/s/files/1/0434/6599/8501/files/lowes_online_rebate.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5676577217.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/cellular_physiology_and_neurophysiology_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/zurabevepuwexu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7958/1352/files/72679217954.pdf
    • https://cdn.shopify.com/s/files/1/0437/1401/9496/files/motikixulanakozumet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/carbapenems_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/uitm_academic_calendar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092c7.bin
196896a17fd9d797dd908455e7ea93d88eacb7feb58206d06947481318366885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C7 5528 bytes
font_01_sfnt_off0000a57e.bin
ed29ecf0ce636307e65204c65aa15153745e4c79213dbee56e7373c141e057bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA57E 10672 bytes
font_02_sfnt_off0000ca1f.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1F 16164 bytes

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