Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14342b00e0778b7…

MALICIOUS

PDF

52.0 KB Created: 2020-08-13 04:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fd4ef4e52cd42610227dd9c093e7989 SHA-1: 6130bfc41fdceb2cdf9a92e9cf3f57f5d3904297 SHA-256: f14342b00e0778b73dad272873e35785d405accd124740e98a6a8fdba34db39a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wb?keyword=equations%20in%20maths%20pdf'. Additionally, it features a large number of embedded external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

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/wb?keyword=equations%20in%20maths%20pdf
    • http://files.mscg19.com/uploads/1/3/1/8/131860787/bamefome_lovigativanilir_minodawexo.pdf
    • http://files.bcox1.com/uploads/1/3/0/7/130776730/pogogo.pdf
    • http://xadef.one5collective.com/uploads/1/3/1/8/131857152/dasewojapipeved.pdf
    • http://peweku.jabcoassocinc.com/uploads/1/3/2/3/132302780/zupodejo-mixatirakale-gamekukuvofanef-nenazafajefaz.pdf
    • https://cdn.shopify.com/s/files/1/0439/4981/8024/files/32202007761.pdf
    • https://cdn.shopify.com/s/files/1/0434/5013/8784/files/nedokedebimunugera.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/zubukiwof.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/pifaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/1907/5737/files/complete_ukulele_chords_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/81457168238.pdf
    • https://cdn.shopify.com/s/files/1/0437/8551/9261/files/difference_between_engineering_stress_strain_and_true_stress_strain.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/78142253708.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0724/files/72065702046.pdf
    • https://cdn.shopify.com/s/files/1/0447/4263/9765/files/37972799253.pdf
    • https://cdn.shopify.com/s/files/1/0445/6543/0431/files/amulet_book_series.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63491738983.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/mexekanibanupixuk.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_off00008070.bin
6d8b1d1d7c22a1cedc945c88f8ebeb6a91c0f80db794ee7822dcc3b20b2f7705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8070 5000 bytes
font_01_sfnt_off0000913f.bin
3ece8e750e2e65b60eb225857ae541ccca9c5a8b9b91454ba1682c497140bd2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913F 10420 bytes
font_02_sfnt_off0000b4ee.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 4324 bytes

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