Malicious PDF — malware analysis report

Static analysis result for SHA-256 707de17ef762a545…

MALICIOUS

PDF

61.7 KB Created: 2020-08-01 13:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa0c9917541de8f27e9ab74c3b82d52a SHA-1: 5c566eb9b3f8c39563817571239ca734bd4d6e73 SHA-256: 707de17ef762a545b6ed8891ee61683a296ca5fb83f68b433e6b17c45b111a12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and heuristics indicating it contains redirector links and a link farm. The embedded URL https://ttraff.ru/pify?keyword=tobira+gateway+to+advanced+japanese+pdf is identified as a malicious redirector. The document body contains numerous links to other PDFs hosted on various domains, suggesting a coordinated effort to distribute malicious content or engage in SEO poisoning.

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.ru/pify?keyword=tobira+gateway+to+advanced+japanese+pdf
    • http://files.acomputerconsultant.com/uploads/1/3/1/4/131437728/petove.pdf
    • http://files.mostkreativeklassroom.org/uploads/1/3/1/4/131453896/7660101.pdf
    • http://files.thedesigncaravan.net/uploads/1/3/1/4/131438541/8693208.pdf
    • http://files.imtawexford.com/uploads/1/3/1/0/131070362/gizunagudirejupez.pdf
    • http://files.ridgewaygardendesign.co.uk/uploads/1/3/0/8/130814043/5475783.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/gadalukusobubolipukedoza.pdf
    • https://cdn.shopify.com/s/files/1/0440/9029/4437/files/64914355335.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0805/files/65372219765.pdf
    • https://cdn.shopify.com/s/files/1/0433/5167/0943/files/61554456755.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9833/files/wovazov.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/67629330471.pdf
    • https://cdn.shopify.com/s/files/1/0435/7118/3777/files/pixipodizodowidewifamanip.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6696/files/verirabuvumiditeru.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/levusamenosajuvaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/77166623179.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9974/files/kajujulovu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073c7.bin
ed78a0500d41920d424d5c8171af49643a03fc4b959415a4b121231428276211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C7 17076 bytes
font_01_sfnt_off0000aab6.bin
0fc1f7b7442666cf45790fe988d9767a6dc12e10e575ffce899ca12861f31b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB6 5708 bytes
font_02_sfnt_off0000be53.bin
9d19c730cd1f70bdca5ca1081c78cf640b97b4ac7f5f1d2de9e7f15a8ab0d89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE53 13384 bytes

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