Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2276212cdcc3e4…

MALICIOUS

PDF

33.8 KB Created: 2020-08-31 19:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d973163db956da701b48327da18d68a6 SHA-1: 80c055cc1d5970aa3e6aff0245e3b4068869dd2d SHA-256: cf2276212cdcc3e4e4a8dc0a6fcc315d380ce48e45ff604bb90811b618664dec
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm. One of these links, 'https://ttraff.cc/pify?keyword=blank+black+t+shirt+template', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO poisoning or a similar technique to lure users to malicious infrastructure via a seemingly benign document.

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.cc/pify?keyword=blank+black+t+shirt+template
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/55340623329.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/bosabolusezas.pdf
    • https://cdn.shopify.com/s/files/1/0462/8411/2032/files/nodokukubabad.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/thomas_aquinas_summa_theologica.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/fetepadokaxejutupigufuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/tufaposazekewezat.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/wivep.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/xaxugaloxo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8209/4494/files/facebook_video_er_pc_exe.pdf
    • https://cdn.shopify.com/s/files/1/0436/9891/3435/files/29073467894.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/alter_ego_a2_livre.pdf
    • https://cdn.shopify.com/s/files/1/0463/1907/5485/files/blank_shirt_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4105/4111/files/nitrogen_cycle_steps_in_order.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2406/files/bulk_apperception_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/xibenivovetomofinada.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047df.bin
d209cc69f936062ca1055251348954e3918e44f78079eb3efd169a11c0945129
pdf-font-stream PDF embedded font (sfnt) at offset 0x47DF 5428 bytes
font_01_sfnt_off00005a21.bin
7d5940d1b905ca83388fcf868e0b4863ef0a14cc3d761c5ad731fff8f399a79e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 9496 bytes