Malicious PDF — malware analysis report

Static analysis result for SHA-256 0160f8a755144eee…

MALICIOUS

PDF

40.7 KB Created: 2020-08-22 22:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b0e59e34ea88ac8810deb8882d3511 SHA-1: 82fc33bd84ab291a0ae7a2a82aa01780af9e9717 SHA-256: 0160f8a755144eee5fe455331367a74bc17c45fdd9c23e7b31d36b2a628a9553
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a malicious URL, identified as a redirector. It also functions as a link farm, pointing to numerous other PDF documents hosted on various domains, likely to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a known malicious redirector confirms a high likelihood of malicious intent.

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.com/pify?keyword=dragon+city+guide+heroic+race+high+super
    • http://files.belgradecommunitymarket.com/uploads/1/3/1/8/131857465/6d073bc3.pdf
    • http://files.newburyporthort.org/uploads/1/3/1/4/131453028/mulejunavoparepugi.pdf
    • http://files.kinder-equipt.com/uploads/1/3/1/4/131483281/5464694.pdf
    • http://files.biancasretreat.com/uploads/1/3/2/7/132740435/aff01fbad3010.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/65628244216.pdf
    • https://cdn.shopify.com/s/files/1/0432/4379/8683/files/bob_lee_swagger_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/60209221708.pdf
    • https://cdn.shopify.com/s/files/1/0448/1702/3138/files/57968164481.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/39429249507.pdf
    • https://cdn.shopify.com/s/files/1/0437/3495/8229/files/wulewovukokubabux.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/cdc_guidelines_hemodialysis_catheter_care.pdf
    • https://cdn.shopify.com/s/files/1/0429/7487/1711/files/emotional_freedom_technique_eft.pdf
    • https://cdn.shopify.com/s/files/1/0434/3922/7047/files/20507795705.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/xufokirexoxojed.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_off00006095.bin
c7e40ef4a35029648be5d6071a399d76f205218046df315ccf134aaa64e459e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6095 5404 bytes
font_01_sfnt_off000072ec.bin
6ccecb153e398f5f0c8c51738511454214597b93898aad13a7709602fa720f8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x72EC 10212 bytes