Malicious PDF — malware analysis report

Static analysis result for SHA-256 183f00e7c17a275b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-07 13:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 793efc61b8ed0eac326a0eb63646b3f8 SHA-1: f2b34798a5334240360ae079c3ae72a72ea4e421 SHA-256: 183f00e7c17a275b4c39c695a1d65b2cf2177439248c377ef0b56c92c3f908ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of numerous links suggests an attempt to manipulate search engine results or to phish users by directing them to potentially harmful websites.

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=ajax+tutorialspoint+pdf
    • http://files.cleancooks.org/uploads/1/3/0/9/130969206/pepejipator-nepotan-vevim.pdf
    • http://files.cedarsmontessori.com/uploads/1/3/1/0/131070151/3228115.pdf
    • http://files.dennisglover.net/uploads/1/3/1/4/131437285/5801829.pdf
    • http://fizep.otto-and-olive.com/uploads/1/3/0/9/130969742/c880a7ad8af95.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/pozowok.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/78761839448.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/rusogerazuzemarowomobob.pdf
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/zevukumulugobira.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/importerror_no_module_named_packaging._version.pdf
    • https://cdn.shopify.com/s/files/1/0432/7152/0411/files/gezijufesugigiperuvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/59548916748.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/zonenit.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/litakomofaliwugelabe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2407/9254/files/xray_resource_pack_1._12._2.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fab.bin
743465d29697cf476c795c6886ffd64794b82d5e63c874864793c862d4e92c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 5168 bytes
font_01_sfnt_off0000715c.bin
6b9d0bdbc1a7c732675401e44e0e7a256b955efd12f7489fe4969ce76fa91dda
pdf-font-stream PDF embedded font (sfnt) at offset 0x715C 14344 bytes