Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cef8cd510b06c3…

MALICIOUS

PDF

45.0 KB Created: 2020-08-20 13:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 123f6e5ff3ac6f8d568137e7c4bc90d0 SHA-1: 34df22e87970f51f4c0cbb520f97ba4c098b8a6e SHA-256: 53cef8cd510b06c3ecaf6f063aa057f10f72e7bf37c7ba6b1369b2c61be41ab9
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a printable calendar. The link directs to a link farm hosted on ttraff.cc, which likely serves as a gateway to further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links further supports a malicious intent to distribute content or redirect users.

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=may+calendar+2018+printable+pdf
    • http://bexotedom.kathrynluster.net/uploads/1/3/1/4/131438873/9494388.pdf
    • http://files.waddingtonmarketplace.com/uploads/1/3/2/6/132682676/vawiwazosasi_xekosinodaro_pamofavuguvituk.pdf
    • http://files.meinradrottweilers.com.au/uploads/1/3/1/1/131163635/jojividip.pdf
    • http://files.mrtsautorepair.com/uploads/1/3/1/4/131437823/vogokan_tujetopafax_xunavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/experiments_in_digital_fundamentals_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/8638/7102/files/ptolomeo_almagesto.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2962/files/kalug.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/98173335223.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/biosecurity_measures_in_pig_farms.pdf
    • https://cdn.shopify.com/s/files/1/0462/1041/6793/files/worasugon.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/bsc_number_theory_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/potensial_dan_medan_listrik.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/vurufepexurijinekilozojad.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_off00006fe5.bin
1e9465eeebf2ac96fd09bfc468109f62616894d82790989e92369b53cdb42df7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE5 5736 bytes
font_01_sfnt_off0000837e.bin
6a3a88d5c0592898bf89e49fc54a75a68f0c06f3e9b2dcbbf53e76319912e38f
pdf-font-stream PDF embedded font (sfnt) at offset 0x837E 10380 bytes