Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c4b80d2de40222…

MALICIOUS

PDF

44.2 KB Created: 2020-08-06 17:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f5195f72fa31b1896fbca0cc2ecaf06 SHA-1: a76dec6f3ec4b77cf339ee69d7a55dbf011451ef SHA-256: e6c4b80d2de40222adcdfe8abe26da3db6a3182e7f50985075741390e2cae1a9
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'biochemical engineering lecture notes pdf' and a URL that matches the malicious redirector. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document, likely intended to lead users to a phishing or malware distribution site.

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.cc/pify?keyword=biochemical+engineering+lecture+notes+pdf
    • http://files.bettinakoch.net/uploads/1/3/1/0/131070476/3277690.pdf
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.pdf
    • http://files.sonserae.com/uploads/1/3/2/7/132712323/b2ab5.pdf
    • http://files.mcfeesilversmith.com/uploads/1/3/1/4/131438891/kujuxuzajusel.pdf
    • http://mifunaki.paulnieman.uk/uploads/1/3/1/1/131163599/putasode-maxoxemibula-tomijowa-zedupew.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/65902812684.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/janome_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/89168634908.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/azusa_street_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7632/1434/files/qubool_hai_written_updates.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/48138977247.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/13414678608.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/tupagazutovunip.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/94714079886.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/mewifemaropusizufudo.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_off000060f3.bin
b20b441344af7d1e3e7f191a249da840fcd9de5a0622af53258bf851f54a7a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F3 5616 bytes
font_01_sfnt_off000073d5.bin
49f1c345582212729590e0456707ca92d3838aef8cba26fbcaa28f8c5b0a0640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D5 2116 bytes
font_02_sfnt_off00007da0.bin
6b0b2fdcf5db91d6526c37e5b168b29192554b0a7cb93f129f61063e3acac563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA0 11732 bytes

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