Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca64a8b9d71f73fc…

MALICIOUS

PDF

41.9 KB Created: 2020-08-07 01:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7dd63c8e2136dcab1ad3f0eba8d987 SHA-1: 66d6c14ee064a15515537e399c7a94bdb7212ced SHA-256: ca64a8b9d71f73fcff09f22aee8759c732a80d6d2685fc9ae491b2052555c724
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a health insurance brochure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that is likely intended to lure the user to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bajaj+allianz+health+insurance+brochure+pdf
    • http://files.lasttimetheywon.com/uploads/1/3/2/8/132815181/sajagijujagome_zilamat.pdf
    • http://files.maxiandolikessler.com/uploads/1/3/1/3/131384721/zazoxa.pdf
    • http://files.mezzinophotography.com/uploads/1/3/1/6/131607777/fijetasanup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0434/4843/4844/files/anamnesis_anak.pdf
    • https://cdn.shopify.com/s/files/1/0435/8062/0963/files/55011019168.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/present_simple_questions_exercises_macmillan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/10029142620.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/66729630133.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/bbg_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/8692/0347/files/bach_minuet_in_g_major_bwv_anh_116.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1237/files/xijemegavolekejelarut.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/62084254883.pdf
    • https://cdn.shopify.com/s/files/1/0434/8946/0376/files/55593726854.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.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_off0000610b.bin
92ec2fdab8c3dfad0309043262c9e4bac9241013b06d0124ebff2aa7fbe4a71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610B 5560 bytes
font_01_sfnt_off000073fa.bin
404e89f36f51495446f763d91dc3682fd7587a7fe84a9a04e89acb96194316df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 12328 bytes

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