Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44839b4481be879…

MALICIOUS

PDF

49.7 KB Created: 2020-08-12 19:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8ef551a4a57951290f9bee821cbaa0 SHA-1: f38829ace8f84395667ac754990f820e327b022f SHA-256: d44839b4481be879590b7eeb196b029662f09d1aed1dbd3e2f6209f0286ffdf0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at https://ttraff.cc/wb?keyword=vogelhaus%20bauanleitung%20kostenlos%20pdf. Another heuristic indicates a PDF link farm, with the first URL pointing to a Shopify domain. The ML classifier strongly flags this PDF as malicious. The document body, though partially corrupted, contains the keywords 'Vogelhaus bauanleitung kostenlos pdf' and the malicious URL, suggesting a social engineering 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.cc/wb?keyword=vogelhaus%20bauanleitung%20kostenlos%20pdf
    • http://files.onalee.co/uploads/1/3/0/8/130813643/4288498.pdf
    • http://files.cedartreeholistics.ca/uploads/1/3/1/0/131069832/836967.pdf
    • http://files.arlenhancockactor.com/uploads/1/3/1/0/131070911/5601175.pdf
    • http://files.swdcollections.com/uploads/1/3/0/7/130776822/6699929.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/ardhanarishvara_stotram_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6791/5936/files/65642051611.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/tawivogikovawovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7278/1478/files/chemistry_notes_for_class_12_state_board.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8071/files/88750187947.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1681/files/kagasatagiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7211/files/wifoguvabotorif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/mastering_physics_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0448/3108/0605/files/1000_vocabulary_words_with_urdu_meaning_and_sentence.pdf
    • https://cdn.shopify.com/s/files/1/0437/5724/0478/files/26481875443.pdf
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/31086840802.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_off00008242.bin
da01f3bcc44efd4c381fe37b85f3df01cbcacad0060b46601effeeb9be6bc107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8242 5376 bytes
font_01_sfnt_off00009488.bin
d93ad434addadf67d266e8e72a7da551354721ba6520676e77250b1c278d4b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9488 10868 bytes

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