Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8e895080d91b18…

MALICIOUS

PDF

43.0 KB Created: 2020-09-06 06:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ef1c3d9af5410c64cb4a14405b23747 SHA-1: e34f7894e9c14d26b5f34ec0682e0712c8e43e7e SHA-256: 9a8e895080d91b185631f13c3b770331b0ba4471db78d0286026a52928cbb278
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a software download. The ML classifier strongly indicated maliciousness, and the PDF was flagged for containing a large number of external links, many of which point to potentially malicious redirectors. The primary IOC is the redirector URL, which is designed to lure users to a malicious site.

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.link/wix?keyword=asphalt+6+for+windows+7
    • https://static.usrfiles.com/ugd/868401_9a4e9575cf354d4d8254838faf2b7171.pdf
    • https://static.usrfiles.com/ugd/217d68_3ee879369ce546a5a366968e9a312499.pdf
    • https://static.usrfiles.com/ugd/4dbf3f_8cefad30db464fe78ce6aab07f0f9b46.pdf
    • https://static.usrfiles.com/ugd/f67134_67f6a2f6fa7b4125b3711a34d80d533e.pdf
    • https://static.usrfiles.com/ugd/fb5067_6829ce090096483c87a763d44b39ec46.pdf
    • https://cdn.shopify.com/s/files/1/0464/7560/8214/files/angular_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8833/files/jokitevofite.pdf
    • https://cdn.shopify.com/s/files/1/0461/4294/7481/files/english_9th_class_guide_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/68810768056.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/ligubagapilaja.pdf
    • https://cdn.shopify.com/s/files/1/0463/3205/1618/files/bisigozuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/you_can_draw_in_30_days.pdf
    • https://cdn.shopify.com/s/files/1/0430/8258/0130/files/20590024475.pdf
    • https://static.usrfiles.com/ugd/067ecb_e3651e4b8a4b4e96b8d9c102a0439eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9a5f1c605a6426e87f9e7d95393b706.pdf
    • https://static.usrfiles.com/ugd/735424_9682bc4972724373badc60cfa3822037.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_off000068fa.bin
6964428e63147c7f2542da5ea3e895cc17eaa9940e7edb7fa94787ebd369d998
pdf-font-stream PDF embedded font (sfnt) at offset 0x68FA 5444 bytes
font_01_sfnt_off00007b97.bin
0b8234e5e400b27bfe103bdb9864def954025a73c58a06b6be8f19aca6777c3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B97 10508 bytes