Malicious PDF — malware analysis report

Static analysis result for SHA-256 7409a9b4a7220bc4…

MALICIOUS

PDF

41.3 KB Created: 2020-08-11 22:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4aeb197e44673d6134d898acab159d7 SHA-1: d8d28b31b690d30bf2d9ce7e490b96473a289e7d SHA-256: 7409a9b4a7220bc4fa23a176dec04a8dae6a78fe94d675123cf0a8c92643e50a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised as a work attestation request. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on Shopify. The ML classifier strongly indicates maliciousness, and the embedded URLs suggest an attempt to redirect the user to malicious infrastructure.

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=demande+d+attestation+de+travail+pdf
    • http://files.michaelstiertherapy.com/uploads/1/3/2/7/132740533/xuxopazorakik.pdf
    • http://tudif.monitheseries.com/uploads/1/3/0/8/130814328/tikuzoriwafigom-sedefo-viletifo.pdf
    • http://files.daneyates.com/uploads/1/3/0/7/130739971/bilusesuberi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1684/6488/files/fesem.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/15090440085.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/72406616725.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/casio_hr-_100tm.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/306295476.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15750122344.pdf
    • https://cdn.shopify.com/s/files/1/0436/3019/8937/files/repokuwol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6727/7469/files/10586707210.pdf
    • https://cdn.shopify.com/s/files/1/0438/5167/7856/files/85327618555.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/36989160505.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/botonetexikube.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/54613417108.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_off0000607e.bin
81469d3e9c3205f430ef2b5455145ee14d111bbb45db5b701bdd861f6ee65784
pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 5244 bytes
font_01_sfnt_off00007241.bin
05d7eb986f639457789a21bb203f2d2e59837e385a22ea2c0313078eafe6e5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7241 11572 bytes