Malicious PDF — malware analysis report

Static analysis result for SHA-256 416b39e4e4b4981c…

MALICIOUS

PDF

45.1 KB Created: 2020-09-03 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a9840b8dcd69e9a8173bf1bbd7ad0c4 SHA-1: bcfb49311cf5a64c06e91875cc5ac5a462e3a28a SHA-256: 416b39e4e4b4981c65f507ae23cb9eb9efc3420ab10f08ad7fb6e5eae49c6f90
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a common tactic for SEO poisoning and link farms. One of these links, 'https://ttraff.me/wix?keyword=c+function+template+specialization+inside+class', is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a malicious redirector suggests an attempt to direct users to potentially harmful content or further stages of an attack.

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.me/wix?keyword=c+function+template+specialization+inside+class
    • https://static.usrfiles.com/ugd/67e251_fcd65ded83f94fce98cfb6e6e32dcbe3.pdf
    • https://static.usrfiles.com/ugd/6f9b04_97b424302abe4d6a85b0d80f65e92a75.pdf
    • https://static.usrfiles.com/ugd/4479ed_7251df3019dd4a3186b6ed14c6f5d6ce.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tepumesuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/niwewanovumet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8291/files/spider_man_2020_comic.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/actos_de_comercio_em_mocambique.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/azolla_as_biofertilizer.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/34423261338.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/lipuxolobavibupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/ludifabeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/9712/8102/files/bosch_tassimo_t47_user_manual.pdf
    • https://static.usrfiles.com/ugd/45fd81_c056f011ad4b4f7a878931a51335ae12.pdf
    • https://static.usrfiles.com/ugd/d1d005_a93f81553c4144c496d617d251bc4c9a.pdf
    • https://static.usrfiles.com/ugd/1c8c1e_b2f1f92aa5814cd29be9376dd38219cf.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_off00006a78.bin
bab2bef16a95d4781315977840e82c94d73d0e4dce1380949b83a40e5b21b952
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A78 5160 bytes
font_01_sfnt_off00007bfd.bin
ba4dc43fb0a081df2b378e3fb2d0ba868d63bea367da8ec00765f2e2dc50ebc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFD 13624 bytes