Malicious PDF — malware analysis report

Static analysis result for SHA-256 500a13bf2b69aa56…

MALICIOUS

PDF

46.6 KB Created: 2020-08-30 20:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e728ee4e57618580fd14d9d9564da282 SHA-1: 0decc457f32927191e26d3c7b5de6bf8f72fe779 SHA-256: 500a13bf2b69aa5670ffafc5bb309806d16285dda39fcadf7bd9dba74f59a09c
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external PDF links, many hosted on cdn.shopify.com, and a critical redirector link to ttraff.ru. The document body, though heavily obfuscated, contains the malicious URL. This indicates a likely attempt to lure users to malicious websites, potentially for phishing or malware distribution, leveraging a link farm to obscure the ultimate destination.

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=neustadt+presidential+power+pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/life_gear_inversion_table_weight_limit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47948794002.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8260/files/bangkok_bts_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/2987/2292/files/nivofisituzifozepepelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/baby_boy_names_in_telugu_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/dubotosowigif.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/zulirawanodafiv.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e20110fd41f4636b6ca4aa6395a8683.pdf
    • https://static.usrfiles.com/ugd/b8c837_7965b7021d734b74bcf01906dc02aa5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_eea4112683c54a28bbe9606a482bf2ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_941cb09722124005a9a745a8750c1b6b.pdf
    • https://static.usrfiles.com/ugd/538d67_c2d70cf9809d4b9fa8db428e117f6f84.pdf
    • https://cdn.shopify.com/s/files/1/0451/1078/8261/files/price_effect_substitution_effect_income_effect.pdf
    • https://cdn.shopify.com/s/files/1/0465/1863/2598/files/50696378426.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/neurofibromatosis_type_2_diagnostic_criteria.pdf
    • https://cdn.shopify.com/s/files/1/0431/4438/0578/files/vuwejukaxogasod.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_off00007899.bin
e996c9691d6f237125523c4ce252ef285a8d57d1c149777344c87a844e60dcd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7899 5096 bytes
font_01_sfnt_off00008a16.bin
a7953b81e213156b1dd6e9f07c5e7815979619ea7e90f2df0f77c7f9d3115064
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A16 10516 bytes