Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2d69ca0117d336…

MALICIOUS

PDF

48.4 KB Created: 2020-08-22 19:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b84c17dd576fbc4540a7e29739b8e7a SHA-1: 56dfd253cd56a44aa11f69c76983876060b86cf5 SHA-256: 7a2d69ca0117d33638c7163db18f0b4452a5f721a4c939de34e9542f61471ca9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO poisoning attack, aiming to lure users to malicious content. 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.cc/pify?keyword=nichrome+alloy+sheet
    • http://zazidop.summitmartialartsacademy.com/uploads/1/3/0/7/130775075/a81646be18b.pdf
    • http://files.crawfordphoto.org/uploads/1/3/1/8/131856290/walasexiw-kizenegid-dufuzurof.pdf
    • http://vuvur.missingpersonsrv.com/uploads/1/3/2/3/132303354/598715.pdf
    • http://files.pureessentialslightcenter.com/uploads/1/3/1/4/131407111/bogokasuwoke_dofekanil_xolivanita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/5493/1624/files/ladikitosemuxoxolix.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/dawej.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/digestion_absorcion_y_metabolismo_de_lipidos.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/vimokarewepijawip.pdf
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/50882158401.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/icloud_photos_without_icloud_for_windows.pdf
    • https://cdn.shopify.com/s/files/1/0437/7011/8306/files/bugujalogutasuxibogama.pdf
    • https://cdn.shopify.com/s/files/1/0429/5871/7087/files/bootleg_movie_sites.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_off00007090.bin
554b81aa2d05f599c6f0f19fafc3d83fd6ca70678df0689b317e6e9513b5bf79
pdf-font-stream PDF embedded font (sfnt) at offset 0x7090 5112 bytes
font_01_sfnt_off000081cb.bin
51faeec3e392c6b13c847cf060f8b6401307dd6dd024d17286f704d7c07dd419
pdf-font-stream PDF embedded font (sfnt) at offset 0x81CB 16312 bytes