Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef0160a734a8424…

MALICIOUS

PDF

54.7 KB Created: 2020-08-06 16:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 340fb5d17e2b1520d0d1975528919181 SHA-1: f0168b5b7b3a50d689d41c8cb8fe4beaa602ee1d SHA-256: 0ef0160a734a842455a78c718ea365832096f84a084f01ba6931d60995f4bbb5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL and the sheer volume of links suggest an attempt to lure users to malicious sites, potentially for phishing or SEO poisoning.

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.ru/pify?keyword=anaerobic+digestion+process+pdf
    • http://files.sculpturebylebowitz.com/uploads/1/3/1/4/131406684/gunev.pdf
    • http://files.paulosibaja.com/uploads/1/3/2/6/132695525/vijunejasavisedegu.pdf
    • http://files.congioia.org/uploads/1/3/1/8/131856212/6543202.pdf
    • http://files.secretbutterflyboutique.com/uploads/1/3/0/7/130776828/tuzumoduponi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/vopalerabasupudokifatego.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1493/files/boxiwakosokatovir.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/90893218847.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/bixidixinezujak.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/kazajex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0437/1755/8426/files/bach_bwv_106.pdf
    • https://cdn.shopify.com/s/files/1/0434/3611/4076/files/13669862764.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/analogias_graficas_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/69668319206.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/kulogotudirag.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/pure_mathematics_2_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0438/8660/8552/files/caballos_para_colorear.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/28263389538.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/31334794402.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_off00008b3f.bin
f2b6913e4d9ed41b568fd49881a2f81da7d97d15f196c4b984d502b47ee14905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3F 5208 bytes
font_01_sfnt_off00009cfb.bin
cab9592d29c297fa24df5c89364d274b36bba04024746bddbedb1c27e2e53bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFB 10104 bytes
font_02_sfnt_off0000bf84.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 4324 bytes

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