Malicious PDF — malware analysis report

Static analysis result for SHA-256 be76e955194c9c94…

MALICIOUS

PDF

41.6 KB Created: 2020-08-04 13:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1145ea6d463c69b21f83203daf83ec SHA-1: e820f78e917a70dcc51ba58a3757bf0f41ecf9c6 SHA-256: be76e955194c9c9437a94965650f0dcbad5fe4037bf32b4d7df3337fe8150048
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to 'arithmetic reasoning study guide pdf'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, including Shopify. The ML classifier strongly flagged this PDF as malicious.

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=arithmetic+reasoning+study+guide+pdf
    • http://files.beavertonsecuritymi.com/uploads/1/3/0/7/130739789/rosadi.pdf
    • http://files.communityprepalumni.com/uploads/1/3/1/4/131453133/bukubexedimerezokuf.pdf
    • http://files.hungary2korea.com/uploads/1/3/1/3/131378780/jozejaludemil_siduvufad.pdf
    • http://files.thetracegrill.com/uploads/1/3/2/6/132682758/96512311a.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/because_he_lives_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/.pdf
    • https://cdn.shopify.com/s/files/1/0434/6255/7856/files/pabazi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/pedukukutubudopixetowave.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/musavesupigosipowulituzo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/pafububar.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/genomifuzez.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/sifutuxitazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/realistic_conversations-_80355-_2-_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8985/files/35826478250.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6789/files/99657099938.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/90705198315.pdf
    • https://cdn.shopify.com/s/files/1/0432/5864/2595/files/uninstall_jupyter_notebook.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000635a.bin
278f59ebcf365a10c1b30936d910340734a5c28b965a8094495799ff48cba491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635A 5628 bytes
font_01_sfnt_off0000765f.bin
d774aa324b2ef99fed290f3108e87d7af5c296baff648c818c621be9e892aace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765F 10216 bytes

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