Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbfa8c9d28b3850…

MALICIOUS

PDF

42.2 KB Created: 2020-08-20 02:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a445138179cb635598b98c44ca6d310 SHA-1: be108d5b40e77f12f4e33a629c24c8021bf1e577 SHA-256: 2bbfa8c9d28b38502ff4db4250d4c88d67b017eb20677cf42168fff215cc9a47
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which points to a URL designed to trick users into downloading a driver. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve SEO for malicious content. 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.cc/pify?keyword=bluetooth+driver+windows+7+free++lenovo
    • http://files.philcohomes.com/uploads/1/3/1/6/131606789/zazenewafuxalelaka.pdf
    • https://cdn.shopify.com/s/files/1/0447/9251/2678/files/33706449515.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/ba_first_year_education_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/1605/1109/files/bumavikudus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/argala_stotram_lyrics_in_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0436/9773/3787/files/94810210093.pdf
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/99277017250.pdf
    • https://cdn.shopify.com/s/files/1/0433/9102/5303/files/26022206243.pdf
    • https://cdn.shopify.com/s/files/1/0433/2978/1918/files/devi_chitralekha_ji_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/favijuze.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_off0000661e.bin
11f915e487dcb71bd6008b4e75d293db52ea5ac8cca194dcf15763defaf64bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661E 5064 bytes
font_01_sfnt_off00007773.bin
dede649c361422d09e308526074d6c290a5e5f8eddec2d87adee363bc43a9315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7773 10784 bytes

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