Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cb65727f1b6ec1…

MALICIOUS

PDF

47.2 KB Created: 2020-08-10 12:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1344aee5a2aa5e6fe6573897d1ddd6d4 SHA-1: a7ab9ac4d68e75285b96fba89ac6c44cbe30415e SHA-256: a1cb65727f1b6ec13d0d60091eb22b4e6db5e16765c16700a3c8ec1e727489f1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body text, though partially corrupted, includes a URL that appears to be a lure for an 'application form'. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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=application+form+scheduled+caste+certificate+west+bengal+pdf
    • http://files.lincolnvillage5.com/uploads/1/3/2/7/132740291/pitejovipefoki.pdf
    • http://files.thomasjonesschool.org/uploads/1/3/1/3/131379525/1216765.pdf
    • http://files.marissameizz.com/uploads/1/3/0/7/130775520/d6eca45af3e95.pdf
    • http://files.strasburgpresbyterian.org/uploads/1/3/1/0/131069899/879ed.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/jitasitepakegakomusaro.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/94406115407.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/bitter_gourd_planting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2051/files/48459695133.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4277/files/kawevulumegodajurudizob.pdf
    • https://cdn.shopify.com/s/files/1/0435/7704/9247/files/nebomigemimakufipivus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/nizakexifufo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/afinidades_electivas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6967/files/76419667627.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/44100627788.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/92127459127.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/10509600048.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2111/files/zijoson.pdf
    • https://cdn.shopify.com/s/files/1/0434/1861/5975/files/virtual_dj_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/70573688124.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_off00007654.bin
b4696f6313f451ab1a3475dfa9dafcb399a2be3434e6e5e2646ad3abc6c8640e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7654 5788 bytes
font_01_sfnt_off000089f5.bin
cc9a2715e3d71498c01a6bfd0bb88899bfe81fd3ea063b88375260da5db1cae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F5 10804 bytes

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