Malicious PDF — malware analysis report

Static analysis result for SHA-256 097d06f1e2f2b83f…

MALICIOUS

PDF

45.6 KB Created: 2020-08-16 19:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bce5e8ef3839bdccf965aea10241b431 SHA-1: 0bb72802c0579f1c842061c6f54b6845e43eb858 SHA-256: 097d06f1e2f2b83fcb7737d5253b937609ea4254dad818ba981430f2bd03a929
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'communication strategy document template' and includes the malicious URL. The presence of a 'download button' heuristic further supports a lure-based attack. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=communication+strategy+document+template
    • http://files.susiegrindey.co.uk/uploads/1/3/1/4/131408256/82314.pdf
    • http://files.pilatesafterschool.com/uploads/1/3/1/3/131383924/8629276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3549/0461/files/zodasibopedaro.pdf
    • https://cdn.shopify.com/s/files/1/0430/6075/6641/files/getutiwatafimobasurugewow.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/tibetan_reiki_symbols_and_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/41115812509.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/ford_jubilee_tractor.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/ffxiv_goldsmith_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/woresuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/game_of_life_quarter_life_crisis_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/15955539844.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_off000073e0.bin
d4aa481a88b92a890482834de4066707687e5fb6c630e2f4bf1beee63ef0ae78
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E0 5400 bytes
font_01_sfnt_off00008625.bin
fba79c51cc7dad910f043b81b2f32b1ae20117a9438e0778db9ff3c6cc383ed3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8625 10476 bytes