Malicious PDF — malware analysis report

Static analysis result for SHA-256 04431eab748eb406…

MALICIOUS

PDF

58.1 KB Created: 2020-08-05 17:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cecbda7139cb69efaf6692e87d07fd55 SHA-1: 323fbd927a7ad031a90fe35f5758baf36e3ce4ea SHA-256: 04431eab748eb4064cc6c2ba56cb02ba20a2e216eb4be0be9d09cec743408dbb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=apprendre+le+russe+facilement+pdf, indicating a probable attempt to redirect users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=apprendre+le+russe+facilement+pdf
    • http://files.finalfurlongracingstable.com/uploads/1/3/1/4/131452880/duxemejusije.pdf
    • http://zusod.lovingheartvegan.com/uploads/1/3/1/0/131070356/xijaven.pdf
    • http://files.sopoligalake.com/uploads/1/3/0/7/130739590/zosemo-bawoxa-vezufexa.pdf
    • http://files.eastcoastspeedwaytv.com/uploads/1/3/2/7/132741555/1895418.pdf
    • http://files.crossroadsbiblecollegeandseminary.com/uploads/1/3/2/7/132710694/nubekeke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5240/0793/files/31693428809.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/50567883553.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/65081422386.pdf
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/fuvixuvatepopipej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3481/files/peminisixosadodesizomijow.pdf
    • https://cdn.shopify.com/s/files/1/0436/4363/3822/files/nekoniwavexiworezemekoli.pdf
    • https://cdn.shopify.com/s/files/1/0434/3391/8616/files/35095214854.pdf
    • https://cdn.shopify.com/s/files/1/0430/6776/8981/files/cs_go_config.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/terraria_not_launching.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008222.bin
ee1a9cbd227673fdccc194dfeaebb7e5fe4196489446a9c7b8f670764e974d53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8222 5288 bytes
font_01_sfnt_off000093fe.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93FE 1800 bytes
font_02_sfnt_off00009c8c.bin
85b1a787e2882793c847429894645375c1c3ca0d6c0fcac935d46d41bc8dc1de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8C 12112 bytes
font_03_sfnt_off0000c319.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC319 16312 bytes

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