Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3871dcb4842284b…

MALICIOUS

PDF

47.1 KB Created: 2020-09-09 00:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7cc798de62bfac0b57bbe2b00400207 SHA-1: e7ac3e6daa026a1c3d76133c8d369e143372eae6 SHA-256: d3871dcb4842284bbf1164985b7cf1c0b0905b528e44109ca8bcf6f1c8bc19af
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.club/wix?keyword=antivirus+microsoft+windows+10+free', is designed to lure users with a fake offer. The document also contains a large number of embedded links to Shopify, likely part of an SEO link farm to improve search engine visibility for malicious content. The ML classifier strongly indicates maliciousness.

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.club/wix?keyword=antivirus+microsoft+windows+10+free
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/libavuvoxupedazowenurege.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/zusosikazexufolazemini.pdf
    • https://cdn.shopify.com/s/files/1/0429/4223/4791/files/rakipesotuzolagalit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19227598733.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/83943628628.pdf
    • https://cdn.shopify.com/s/files/1/0434/9070/5573/files/nicky_jam_e_sua_esposa_damaris.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/59273585525.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/executive_support_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/61201337064.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/mujatisekete.pdf
    • https://static.usrfiles.com/ugd/121e37_93f16c7cb06545f5b634ed7fd74f7962.pdf
    • https://static.usrfiles.com/ugd/353d00_5024c9e338ac45dca0769aa08786d4be.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_6be1c3cefe8c4e01b243afb7592ce3d0.pdf
    • https://static.usrfiles.com/ugd/1e4819_6ef8e22c57d6496b9931f0765bb29c91.pdf
    • https://static.usrfiles.com/ugd/9c0842_ff6e30f1d4b947629e639ed8150e053b.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_off0000790f.bin
0656a1f277cb57b9ae7649673d140ad814bbc0cb90e6094a15d99305cb8914ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 5260 bytes
font_01_sfnt_off00008b00.bin
42d9db9d08e4142079f74fb414a7b0a8931a38c6ad2f664a8255733747156753
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B00 10704 bytes