Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf16be07647d9581…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 06:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ac4f9b04eda49bb7cb8d00212991ff7 SHA-1: 73c2c9b94bd04c59f298065e0e6d6a5c23b5fda7 SHA-256: bf16be07647d958153816038f2030694d9356f452ba5215d598915914bf32f69
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=andrew+scheer+platform+housing', which is also listed as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links pointing to external resources, including 'https://static.usrfiles.com/ugd/7e6083_2158d3f90b28459e869ea0f005b5100d.pdf'. This suggests a campaign to lure users to potentially harmful sites.

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/wix?keyword=andrew+scheer+platform+housing
    • https://static.usrfiles.com/ugd/7e6083_2158d3f90b28459e869ea0f005b5100d.pdf
    • https://static.usrfiles.com/ugd/2b25b5_6a8620b35de4465ba2fb2195cb0005cf.pdf
    • https://static.usrfiles.com/ugd/a467d2_871eda57a3314158a3fcbfe436979ff0.pdf
    • https://static.usrfiles.com/ugd/6116da_fc77820e4b824d66b81d1e567aea7978.pdf
    • https://static.usrfiles.com/ugd/5de1df_ebced328404a4063bac1c19b902560d9.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_0f82ea015c7f4b528779f90aae1d7158.pdf
    • https://static.usrfiles.com/ugd/e73fea_ee4d660303a64a1b82dd368aaeaed9ce.pdf
    • https://static.usrfiles.com/ugd/e32576_a0f24775b8064a088cfec98b3224d3e7.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/gmc_acadia_2014_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/aihwa_ong.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/43436503766.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0449/5353/4632/files/58344357151.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_off000070b1.bin
16c756631f8516e11169a38041c86b61e7e494718a522697105720cf13b6108f
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B1 5652 bytes
font_01_sfnt_off000083d4.bin
dae4a902dc10d54cba0c9b353c639a111b5d85e463a0f7d3a9437c11c1e6a111
pdf-font-stream PDF embedded font (sfnt) at offset 0x83D4 10444 bytes