Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2af9035a75b56e…

MALICIOUS

PDF

45.3 KB Created: 2020-08-26 15:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a93227eb6b651ac27042d013638a542 SHA-1: c8a4bbf3f05029de67e82ac10efbbad047b9a3b2 SHA-256: 4d2af9035a75b56ef6693499ea759c7d2230279e87315653b2b98c018cc7a773
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content. The document body, though obfuscated, contains the text 'Idylis humidifier manual' and the malicious URL, reinforcing the lure.

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=idylis+humidifier+manual
    • http://wibevire.gillilandhcwildrags.com/uploads/1/3/0/7/130775407/lipetu_mepinu_bebisifuzegivev.pdf
    • http://files.sylviedesign.ca/uploads/1/3/1/4/131408170/ec23791e.pdf
    • http://files.petra1929.co.uk/uploads/1/3/0/8/130814205/disoxukaxugem.pdf
    • https://cdn.shopify.com/s/files/1/0428/7702/6463/files/82791368003.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/update_android_box_x96.pdf
    • https://cdn.shopify.com/s/files/1/0438/4528/8093/files/apc_backup_ups_es_550_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/mefen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/nejenipukapudaxurilani.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0439/7747/4206/files/jirajugis.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/fonojibimikesotiluzuri.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/mukaruporidatitobuvuji.pdf
    • https://cdn.shopify.com/s/files/1/0439/2452/1128/files/19556922557.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006696.bin
28796f059d057961cf02b9817bf1a0201d8830e16a84e50a1f88e30326d78251
pdf-font-stream PDF embedded font (sfnt) at offset 0x6696 4880 bytes
font_01_sfnt_off000076ed.bin
7656c1fcbee3ba423da7c29a78c8763b6b806613c437ad9a0f098812ce6184f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 10380 bytes
font_02_sfnt_off00009a5f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A5F 4324 bytes