Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f68745d8ba0c26…

MALICIOUS

PDF

38.1 KB Created: 2020-09-06 22:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dc5dc09cb8720b224a83bd28eb8988f SHA-1: 0874b99dd92bb198bb08d0b7905da0388aa48353 SHA-256: 85f68745d8ba0c2616578c7f7ea4511e5f30866391401eb6201a434d709f6c02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=flowsheeting+of+steam+cracking+furnaces'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which lead to benign Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'Flowsheeting of steam cracking furnaces' and the malicious URL, suggesting a lure to a malicious site.

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.me/wix?keyword=flowsheeting+of+steam+cracking+furnaces
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0444/6031/0695/files/vegetable_biryani_recipe_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0434/7956/4448/files/7872492127.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/1814203604.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/tulesiworapajuxopoxelid.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a24bd9f1bc7496996d93b0c6e9612e2.pdf
    • https://static.usrfiles.com/ugd/0c4177_3de2a8f2c1b04ecb9c04f1d48a7c33cd.pdf
    • https://static.usrfiles.com/ugd/2f3216_e2776dcbab394698b5d21473fad199c3.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/never_back_down_ost.pdf
    • https://cdn.shopify.com/s/files/1/0447/8536/9239/files/fallout_4_modding_guide_mod_organizer_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/0224/7838/files/35604305012.pdf
    • https://cdn.shopify.com/s/files/1/0447/6112/0919/files/balance_de_comprobacion_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/53127675185.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.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_off00005691.bin
782c3412827158fe29483f47fc7bc902c559a4981d9336c47cddacf6c5d78728
pdf-font-stream PDF embedded font (sfnt) at offset 0x5691 5404 bytes
font_01_sfnt_off000068e5.bin
2c0666ad91216732c0e4ca69e41c1e857b2b923662e8c60b109e51c99b4c80ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x68E5 10156 bytes