Malicious PDF — malware analysis report

Static analysis result for SHA-256 840b766431d806fb…

MALICIOUS

PDF

45.4 KB Created: 2020-08-16 21:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5ba8e24168b30b9d4df26baafd0d058 SHA-1: 58a77e98bb723e4a9332ab5d4fe4028aea317d97 SHA-256: 840b766431d806fbe14dfb2becfba5942a6ea26b8e0db5880386c6d546b13c32
194 Risk Score

Malware Insights

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

The PDF contains multiple links, including one that redirects to known malicious infrastructure at 'https://ttraff.ru/pify?keyword=filipino+christmas+songs'. The document body, though heavily obfuscated, contains text related to Christmas songs, likely a lure. The presence of numerous external PDF links, many pointing to potentially benign Shopify URLs, suggests a link farm designed to obscure the malicious redirector. The ML classifier strongly indicates 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.
  • 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.ru/pify?keyword=filipino+christmas+songs
    • http://files.joanhbrackcharitablefoundation.org/uploads/1/3/0/7/130775163/ragumivud.pdf
    • http://files.moonflowerproduction.com/uploads/1/3/1/3/131378932/naxufapurokusoj.pdf
    • http://nodexaveg.tokyodrivingschool.com/uploads/1/3/2/3/132303382/xafibejenikexeg-kofojobi.pdf
    • http://files.crconfections.com/uploads/1/3/0/7/130738889/2213691.pdf
    • http://files.secondarysummerreadingprogram.com/uploads/1/3/0/9/130968950/degijexus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/ayushman_bharat_package_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/solo_guitar_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66179678401.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/dixiwumapozov.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/68513829807.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/79847025348.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/cat_touching_plasma_ball.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/ledat.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/aes_encryption_algorithm_steps.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000681b.bin
f5e40a9d93e0fb8e9965d766d12900ed25ef6a39564cd5909f325a64e1fa1910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681B 4972 bytes
font_01_sfnt_off000078ba.bin
5397e8f957fb19450f49e0e02defd112423afd61f8ac2907a65f7fa897f5c709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BA 9968 bytes
font_02_sfnt_off00009ae4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE4 4324 bytes

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