Malicious PDF — malware analysis report

Static analysis result for SHA-256 22253f6b462cc05c…

MALICIOUS

PDF

40.6 KB Created: 2020-08-06 20:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2262a05dd580d655868eae947e9e1496 SHA-1: 15b96aaa21dd27a6487c061415e96d40a41e37fd SHA-256: 22253f6b462cc05ce5687c03b5d0a36a994b9b229cc2f1dbe4e794c54335f402
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a critical heuristic due to its inclusion of a link to a known malicious redirector, ttraff.com. Additionally, it contains a large number of external PDF links, characteristic of a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be the distribution of malicious links through a PDF document, likely to lure users to phishing sites or download further malware.

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=incidencia+definicion+pdf
    • http://fetunu.eimtaiwan.org/uploads/1/3/2/6/132696323/tiratileg-repokodom.pdf
    • http://files.youtubetv.org/uploads/1/3/0/7/130739535/papowujer_koxizonaw_fogaxut.pdf
    • http://files.nosterud.com/uploads/1/3/1/3/131379699/jabuvitixabigen.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/68036339448.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/small_file_jpg_to.pdf
    • https://cdn.shopify.com/s/files/1/0429/7913/1551/files/duvezizigadudelotidorubob.pdf
    • https://cdn.shopify.com/s/files/1/0433/9492/4700/files/2760218701.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/rokalipuxetebipemovobelid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/65042472217.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/powazuxegotada.pdf
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/tasetixojobamirawomagi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3959/files/39733647828.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/firefly_episodes_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/84956022085.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_off0000625c.bin
cea1db50fd6f7e582a53506588a6c47adda1a78ffc796fd2f9a5cda521b7b5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625C 4780 bytes
font_01_sfnt_off000072b9.bin
4ab20450ba6e91cf45c84d6972374c9b58c66a779bdf6caa8fb61484f56ecda4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B9 10336 bytes

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