Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebff70fc56833514…

MALICIOUS

PDF

42.8 KB Created: 2020-08-14 04:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39fcf5aa0e0756ae925711f0421a6a4d SHA-1: b938d882a2c56ae832e5b965eb814e75f33421a7 SHA-256: ebff70fc56833514fd271a5312473a42a8b9fda6d0f469d25a8ff6eb18491120
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to benign Shopify domains but some to unknown domains. The primary malicious URL, https://ttraff.ru/pify?keyword=english+grammar+rules+and+usage+pdf, is likely intended to redirect the user to a malicious site. No scripts were extracted from this sample.

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.ru/pify?keyword=english+grammar+rules+and+usage+pdf
    • http://merolodep.conbeersfarm.com/uploads/1/3/1/3/131380845/girorotezo.pdf
    • http://files.westfieldkennels.co.nz/uploads/1/3/0/7/130775033/2a33ca7.pdf
    • http://files.growingdayspreschool.com/uploads/1/3/0/8/130873795/lixenanizumexaj-wavizaje.pdf
    • http://files.mysecondhandrose.com/uploads/1/3/1/4/131437535/935886e414b3.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/apa_citation_machine.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/wow_classic_leatherworking_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/wefoxaxunividogup.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/13247134432.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2753/files/chuyn_i_sang_hnh_nh_trc_tuyn.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/45922144041.pdf
    • https://cdn.shopify.com/s/files/1/0438/0783/4272/files/e_bildirge_kullanc_deitirme_formu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4512/files/onenote_annotate_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/xupominidak.pdf
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/93449722324.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/59265577169.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_off000066d9.bin
d5acfb94f3cb892f8a2f733667fb1ebebddb7cb28a32a3c64624599a7066807f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D9 5412 bytes
font_01_sfnt_off00007915.bin
65888f6417e2b281150a8e3a9f1389ab25b1ee311424a4cb4fab91e07bc585fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7915 11832 bytes

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