Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf42cb1f5e68d16…

MALICIOUS

PDF

43.8 KB Created: 2020-08-10 06:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc885abcb968f190999cb4f67b52fbbf SHA-1: 791b56ac6b491b26c849c65baaf1d16ab552d00c SHA-256: 6cf42cb1f5e68d16502d2676bddfd8cb9e7758eeb7d67d945b9cd4fc2a38c7b1
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, which is likely used to distribute further malicious content or phishing pages. The document body, though obfuscated, contains text related to educational notes and the malicious URL, suggesting a lure to entice users to click the link. The ML classifier also strongly indicated 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.com/pify?keyword=class+10+acids+bases+and+salts+notes+pdf
    • http://files.alchemyairwerks.com/uploads/1/3/1/3/131378771/vosunazi-fakikavoxidi.pdf
    • http://gavow.smoothtransformations.com.au/uploads/1/3/1/3/131383657/pubovifidokunavaguxo.pdf
    • http://files.brentwoodbayvet.com/uploads/1/3/0/7/130775583/pezos.pdf
    • http://files.cedarkeyoutfitters.com/uploads/1/3/2/7/132712116/muduxolivulamo-beneselakizote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/wimow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9999/6839/files/34112225386.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/75300039797.pdf
    • https://cdn.shopify.com/s/files/1/0440/5349/5958/files/5889990077.pdf
    • https://cdn.shopify.com/s/files/1/0435/0964/5478/files/xujurefadabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/6213020554.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/trueman_s_elementary_biology_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/0377/1041/files/mupisajazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/zomigowisurimed.pdf
    • https://cdn.shopify.com/s/files/1/0436/6175/4518/files/puzurukaselizaxub.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/zanotomuvuvomofa.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_off00006e5f.bin
c335ea91d117ccd29ba7f9ba4eef382a390d90e1e0a59c2c3a8a867dc4a458b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5F 5292 bytes
font_01_sfnt_off00008068.bin
19bf17c6737309aa59e0058d9fb8e6653fab7d2d27615f9a40a98980190670bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8068 9916 bytes