Malicious PDF — malware analysis report

Static analysis result for SHA-256 743cb7c503a00778…

MALICIOUS

PDF

41.3 KB Created: 2020-08-22 04:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d557fc5e5e3ac133729c76aac4b6bf4 SHA-1: a8660d47c8c7d29b319eb2a3e3e573020ae61975 SHA-256: 743cb7c503a0077813146ed8385896c5bf82094c2e7aeacc91010571f6d035e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a free bootstrap template. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or SEO poisoning attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

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=free+bootstrap+4+template+by+colorlib
    • http://volopin.kevinroylance.com/uploads/1/3/0/7/130738546/pogebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/33417968539.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5757/files/vipabegijaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/merge_sort_arraylist_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/6965/9549/files/gulf_of_mexico_fish_identification.pdf
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/27168029385.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/gefoxuxader.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/wijorideruzaruzuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/devovupawojutid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56325204281.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006467.bin
7db6add8ca2ca2c0bbc0b2730e8804341dc5e9a2393c69690204d16e104be561
pdf-font-stream PDF embedded font (sfnt) at offset 0x6467 5364 bytes
font_01_sfnt_off00007699.bin
e3fa5cef960590a5ffa9c3055b5f6047c52abefb1fe06f1c051f3624ccfbd115
pdf-font-stream PDF embedded font (sfnt) at offset 0x7699 10052 bytes