Malicious PDF — malware analysis report

Static analysis result for SHA-256 770656f685d442af…

MALICIOUS

PDF

42.7 KB Created: 2020-08-16 17:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f628401b7ac1f3b46c7b122a118867c7 SHA-1: 3eee482b9ea8ca8a91e7b04ede89475cb8dec1e9 SHA-256: 770656f685d442af6d4d2e3b71f68fcff4d84be5a0af2891553d5df592582e19
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of the URL https://ttraff.cc/pify?keyword=happy+sunday+beautiful+images strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

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.cc/pify?keyword=happy+sunday+beautiful+images
    • http://nadar.apdcwa.org/uploads/1/3/0/7/130776445/49d0a73625f82cc.pdf
    • http://pazupop.emporiumofcanton.com/uploads/1/3/1/3/131380600/1987213.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/rutubosolubifukan.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/megoxoxatejepufefek.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3267/files/zudumobazoninulebarilomid.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/tabawevibejofatoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/molukutozaruxavupemifin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/lowiziwunoni.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/vepukejobodazan.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/thailand_australia_free_trade_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2946/files/31130576886.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/lafurirozubi.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_off00006b93.bin
38e7e05082d963f2b948de87222879478fcfcea6df864b70265b1cd89ea46dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B93 5468 bytes
font_01_sfnt_off00007e1c.bin
4f1ba79494a58c169085d63a41d0cb00b7608df35eb84c9e0708c6a8eab83429
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1C 9424 bytes