Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac4fdb90128d776…

MALICIOUS

PDF

39.0 KB Created: 2020-08-27 20:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf05d1c51da4fb9646d52b6699dfcc4d SHA-1: 4c834028eb900950061d9db9b42f580795e5bbc7 SHA-256: 3ac4fdb90128d776ce55132565965e68d5502d6b3f8a38b11cc77f9351d6e706
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=descargar+pin+para+blackberry', likely leads to a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many hosted on Shopify. The ML classifier strongly indicates 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=descargar+pin+para+blackberry
    • http://rawebirev.alexlawkc.com/uploads/1/3/0/7/130776483/fc407d5957e0.pdf
    • http://memoki.pesfusd.com/uploads/1/3/1/4/131437354/vufokop_tevawetawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/66766652654.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/nijegixitimateroxetimim.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/53833424074.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/nuzoxuwivo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/lukorogimifelu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/negokemogadudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/zarapumigowozo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/42106076151.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/developing_receptive_skills.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_off00005b35.bin
85f4aad36b7a55cbc4ae5ab2d43846b7b3019306b3b8c5bb671b7cb85b5b7fe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B35 5408 bytes
font_01_sfnt_off00006dae.bin
476cb6be90b74a39f2c17386814f578aca51561a73b4d03d0763d51847087f79
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAE 9920 bytes