Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac2969b947176d3…

MALICIOUS

PDF

46.4 KB Created: 2020-08-30 17:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36061b466f87b98e2610e5dfe74d00be SHA-1: 430021c4b2504011240f1671e3097b59f0262794 SHA-256: 4ac2969b947176d35a62389e7663e509636c1e2d0edb5374cbcdb7655a02a2f4
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is presented with a search query for 'Hot coffee mod gta 4'. This suggests a lure to entice users to click the link. The file also contains a large number of links to PDFs hosted on Shopify, likely part of a link farm to improve SEO for malicious content. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=hot+coffee+mod+gta+4
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lurexemip.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/24657178802.pdf
    • https://cdn.shopify.com/s/files/1/0449/6185/7695/files/dozobarexamelok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72905654063.pdf
    • https://cdn.shopify.com/s/files/1/0435/9526/8264/files/late_homework_pass_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/3129/7185/files/fijorinusalejodokorimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/vazegej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/chevy_s10_zr2.pdf
    • https://cdn.shopify.com/s/files/1/0433/6068/2139/files/resume_cover_letter_template_for_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/tunomaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/9132/9173/files/gaxebukudasano.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_off00006a36.bin
dc60fa8c61ba73fc658700350cb494cfe992d05853aa4691259d5da58f3d5134
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 4716 bytes
font_01_sfnt_off00007a42.bin
7f68d38e3950a000eb0d92c43e0d9c4024021104ab451e02ec3b55feea69e9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A42 10748 bytes
font_02_sfnt_off00009f13.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F13 4324 bytes