Malicious PDF — malware analysis report

Static analysis result for SHA-256 6623c1255f9ecabf…

MALICIOUS

PDF

36.0 KB Created: 2020-08-20 07:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8df47406dcb3a210300bed497a11de3d SHA-1: 634c04087b2b92f2bd640f126df9af4b7a62ebec SHA-256: 6623c1255f9ecabf169194c87c021d46f78ac7e6c1b725421561328bd03d25a8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a game download lure and the malicious URL. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm designed to distribute malicious content.

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=cactus+mccoy+3+game+free
    • http://mevedo.c2p.com/uploads/1/3/2/6/132681352/xojumenojo-lurijikix.pdf
    • http://xowilaji.piratechaseracefest.com/uploads/1/3/1/0/131070001/7243072.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0925/3281/files/arc_welding_workshop.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/netgear_wgr614_v_7.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/carmen_habanera_cello_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdf
    • https://cdn.shopify.com/s/files/1/0440/1650/0886/files/vapamev.pdf
    • https://cdn.shopify.com/s/files/1/0465/1597/8390/files/82086383676.pdf
    • https://cdn.shopify.com/s/files/1/0437/6605/5063/files/63526840959.pdf
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/bagexujowegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/writing_sample_for_graduate_school_application.pdf
    • https://cdn.shopify.com/s/files/1/0439/0735/0696/files/aha_guidelines_for_hemorrhagic_stroke_2018.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fe3.bin
4692feb4c4eac2bc69abc319f653552a44121d0caa5965bfd9e1f5e756c1ac5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE3 5340 bytes
font_01_sfnt_off000061fc.bin
832b9a834c2797d62f21f0328dcf0de20dfb6515417b9dcb59fbd619aff13135
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FC 9896 bytes