Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6fb44050137335…

MALICIOUS

PDF

43.3 KB Created: 2020-08-10 08:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14f9e690baa7085609e7924ce85a8288 SHA-1: 6f25d956607e28162b5e9e9e52312eabeaa26f22 SHA-256: ea6fb4405013733540fc49c32ea6cc20d79f0d050eb77fed9abd7573e9025865
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL https://ttraff.cc/pify?keyword=trapianto+cellule+staminali+emopoietiche+pdf, which likely leads to a further stage of the attack. The document body contains garbled text but includes the same redirector URL, suggesting it is the intended 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=trapianto+cellule+staminali+emopoietiche+pdf
    • http://files.anytimeautoparts.ca/uploads/1/3/1/8/131871518/lesujotas.pdf
    • http://files.ratiocoffee.ca/uploads/1/3/2/3/132303028/3067586.pdf
    • http://dubelogep.danielreist.org/uploads/1/3/1/6/131606227/6850024.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/32578640300.pdf
    • https://cdn.shopify.com/s/files/1/0428/9704/7718/files/33900221575.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/how_to_add_accents_in_google_docs.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/6377192735.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/7330669159.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/fasimexopanovemox.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/lotameniziwutiremelujutuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/betikage.pdf
    • https://cdn.shopify.com/s/files/1/0450/2369/0916/files/asia_selatan.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/kagusiganazafomez.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/31508515966.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/loxutiwijadewafulon.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_off000068cd.bin
c5fedd6d6b728015cc54b9f51345229b20951cc3a8b51f3a460b1a67d533dda5
pdf-font-stream PDF embedded font (sfnt) at offset 0x68CD 5344 bytes
font_01_sfnt_off00007acb.bin
a31db6079b0ee9b62b36bb1370887e2362668970b65ebaedc5e836fad322554f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACB 11084 bytes