Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c40c4a0c4abc89…

MALICIOUS

PDF

34.6 KB Created: 2020-08-04 18:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72f3989f52c4fff638949274eec597d8 SHA-1: 79be5d0c6489c23a4f8ed7368a39815de5a72b0d SHA-256: 82c40c4a0c4abc894c756241876828acc8fa76d667139634e9d6f84167fce925
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, and one critical link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the string 'Beauty and the beast pdf sheet' and the redirector URL, suggesting a lure to a link farm or SEO scam. The ML classifier also strongly indicated maliciousness.

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=beauty+and+the+beast+pdf+sheet
    • http://files.ncnats.org/uploads/1/3/1/0/131069887/7645322.pdf
    • http://files.lighthousetransactions.com/uploads/1/3/2/7/132740485/fokom-fugaje-nozotise-kovoxenimoxi.pdf
    • http://files.catherinecarterphotography.co.uk/uploads/1/3/1/4/131405977/selikivutanu.pdf
    • http://files.eatplaywed.com/uploads/1/3/0/7/130775953/gepibumiru.pdf
    • http://files.johntraegerstudio.com/uploads/1/3/0/7/130775659/damarol_kusetu_dibal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9978/3319/files/36531914653.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/jenawezepojonopuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/fobipaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/99341352272.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/sosepolivopiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6799/files/jubilulelezije.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/87525017002.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/varikoxigubofuzafadepax.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/36735456915.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/kusoje.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_off000049b8.bin
0b67b379df80fd02e91942efb5e3aca1a402848a16903b38e0da0763257a512d
pdf-font-stream PDF embedded font (sfnt) at offset 0x49B8 5292 bytes
font_01_sfnt_off00005bba.bin
a6e62fe3f08914f6298d1c1b2db6873b2af3db8c9c3012a4e4f9bc055512deb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBA 9948 bytes