Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d47b72065d386a…

MALICIOUS

PDF

42.2 KB Created: 2020-08-04 02:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8ec4e8783a6146f3e98a74fcacd9ccf SHA-1: a3dd6f27f7f1956b7976af236a0fc999f483f05a SHA-256: d8d47b72065d386a66127063a1d2a3b936b4720d7c26589ef852ad73557df42d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to a known malicious domain (ttraff.ru). This indicates a social engineering attempt to lure users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=quality+assurance+role+in+pharmaceutical+industry+pdf
    • http://files.vietnamcafesandwich.com/uploads/1/3/0/7/130775563/adcb77c45c.pdf
    • http://files.sanctuaryofpraise.net/uploads/1/3/1/3/131383825/vurojilubumibiko.pdf
    • http://files.barbarakrichardson.com/uploads/1/3/0/7/130739826/sirugepukij.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/wild_animal_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0436/8026/8438/files/tujuwigalotosutipi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/kufexixor.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/fupebugobefololax.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/99181721673.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/f_03_fireguard.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/rowetomizisumovugazin.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/gimaxinitarakagopilemux.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/77998386915.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/wigiwunuxoki.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_off000067a5.bin
9b65a14bb27d9352d4e534c90bbe7cb559f97a47c4dd272ac0fb33f104173075
pdf-font-stream PDF embedded font (sfnt) at offset 0x67A5 5556 bytes
font_01_sfnt_off00007a65.bin
e48a64954b3e9cfc566703477dc76c6b0343115dd271cb60c4f70bb0e2edfb80
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A65 9720 bytes