Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc759f7a6202fe0…

MALICIOUS

PDF

42.7 KB Created: 2020-08-23 15:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a724d0fe45b57d36ccbbc23f05ac2868 SHA-1: 087eeac76dde3e8d29bf95a6ec92220c1b70c828 SHA-256: 0fc759f7a6202fe04b1b5739780a0501b7d911bfd5ba1499abbc3a895d6eaf91
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL for the malicious redirector. This suggests the primary purpose is to lure users to malicious sites, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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=conundrum+red+blend+tech+sheet
    • http://nanuf.waltersgreenangling.com/uploads/1/3/0/7/130739415/7493851.pdf
    • http://gituj.augustinoloprinzi.com/uploads/1/3/1/4/131407498/bawopurek_pozatus_nonegedaw.pdf
    • http://fumaxi.bottomfeedersthemovie.com/uploads/1/3/2/8/132814930/fd0d1f9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/19770756154.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/mass_effect_andromeda_strategy_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6063/9384/files/python_if_file_exists.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/table_tent_card_template_publisher.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/manewazidiwumoki.pdf
    • https://cdn.shopify.com/s/files/1/0435/0266/5892/files/80380352401.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/police_report_chicago.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/seludereregidananu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1448/files/wotifetuxikilovenowaral.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/dnd_5e_beast_list.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_off00005ddd.bin
ef05039777b3483f18f5a7af8bb2fcafc973266902f56fcfd829518dfd593960
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDD 4968 bytes
font_01_sfnt_off00006e88.bin
a0c0fd79fa64d77f2f44f65a6df5247c4b180bd2add2122f80c74be3dd9a1a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E88 9724 bytes
font_02_sfnt_off00008fd8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD8 4324 bytes