Malicious PDF — malware analysis report

Static analysis result for SHA-256 f825204128dac5d9…

MALICIOUS

PDF

39.7 KB Created: 2020-08-23 21:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2616213796ffdd9cc56bfc706f359bd9 SHA-1: 716c6cee4ddf6e25f3ab13b19cd433c92f66efd7 SHA-256: f825204128dac5d9d8ba678fea3d5a59496d715d80e8110989c6403e68959417
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a URL advertising a game download. This link is presented as a lure to trick users into clicking it. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. The ML classifier 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.com/pify?keyword=bloody+roar+3+full+game+free
    • http://xakolom.ambitiongogetit.com/uploads/1/3/0/9/130969723/4d46f021015c86.pdf
    • http://files.beyouglobalnz.com/uploads/1/3/0/7/130738712/49e4fd9c.pdf
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/sql_interview_questions_and_answers_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/ultimate_guitar_chord_chart_book.pdf
    • https://cdn.shopify.com/s/files/1/0454/3496/2088/files/57155862981.pdf
    • https://cdn.shopify.com/s/files/1/0432/8403/7792/files/2pac_changes_lyrics_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/apple_store_app_for_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/80165049576.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9245/files/tuxisupumuruzosokofazoves.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32773531818.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_off00005e43.bin
03600f88fa28d8bc571c441e0e89233e6401991ce62eaa50f424e459217705be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E43 5364 bytes
font_01_sfnt_off00007074.bin
ca541daedfce4b4a92f1ebb22a75a774632b0ab74b7b7260fbd2feff6c2fd268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7074 9948 bytes

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