Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abe41225c821445…

MALICIOUS

PDF

45.4 KB Created: 2020-08-02 12:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d441b3a8660dfe83b29e4e67009dde90 SHA-1: 3ec0befe7776861c46d8277e057537bb7e2eeddc SHA-256: 9abe41225c82144546092fdc38b2af742914caa690c3445c6d0fbbdd373ca1b0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, forming a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=does+brook+ayers+have+cancer', suggesting this is the primary malicious payload delivery mechanism. The ML classifier strongly supports the malicious nature of this PDF. 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=does+brook+ayers+have+cancer
    • http://files.stringsforhope.org/uploads/1/3/1/0/131070604/5929030.pdf
    • http://files.zontafortworth.org/uploads/1/3/0/8/130814063/5823781.pdf
    • http://files.theshamandoctor.com/uploads/1/3/1/4/131453395/putesuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/50379815234.pdf
    • https://cdn.shopify.com/s/files/1/0434/4283/1522/files/mirete.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9939/files/18994732227.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4665/files/lomutidoxikofota.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/latoxufixoduwisoxujiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/bixoruli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2057/files/zivefuxefisepapupofuxed.pdf
    • https://cdn.shopify.com/s/files/1/0433/5101/5577/files/tisojobareku.pdf
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/12435042908.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/wii_u_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/texivabuvanakev.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/
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000067ae.bin
a2c6ce84a02b429357f0202f4b2746d600fc542cafc71d8252bf5004d9982838		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x67AE 4880 bytes
font_01_sfnt_off00007835.bin
01516ebe35e9ab5dbfc4c0b2a65a65b6e9aaad0c7b7f24a6039eef5833e8d98b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7835 9968 bytes
font_02_sfnt_off00009a59.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A59 4324 bytes

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