Malicious PDF — malware analysis report

Static analysis result for SHA-256 48853c1ff0222688…

MALICIOUS

PDF

45.6 KB Created: 2020-08-21 07:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 084ef8dbdf5449944a9885828da2e2d9 SHA-1: 26ef7f5a1f52e82f444d42745c128147a23e31e8 SHA-256: 48853c1ff0222688336873b001ed3353c7e4c6e9043ce2e2371c70f838cec946
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is characteristic of a link farm. One of these links, 'https://ttraff.cc/pify?keyword=avengers+infinity+war+netflix', is known to redirect to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

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=avengers+infinity+war+netflix
    • http://gezodi.berrydigitalsolutions.com/uploads/1/3/0/8/130874493/suzunevotinapoz.pdf
    • http://gurel.backpackconnections.com/uploads/1/3/0/8/130874064/vufoseg.pdf
    • http://files.farmandgardencamp.org/uploads/1/3/1/4/131409709/93c49a.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/ziledaxarowawimemapuluj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/tadugesinumimu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5011/3943/files/brunner_and_suddarth_13th_edition_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/suzopatixomeko.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1158/files/75526194940.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/33851030076.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/76588009384.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/66466524047.pdf
    • https://cdn.shopify.com/s/files/1/0431/0024/2077/files/lolezegajalajajosasefus.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/mozezatumazazurekut.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_off000072c8.bin
54bbb37a160d8d4d863204a3518053c450d83f331c37ecfad073a55f2b028228
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C8 5248 bytes
font_01_sfnt_off000084d1.bin
d21f6541fe0f7bf21e75c664be4bce1547741188e04083837a22927989fd81dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D1 10648 bytes