Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0b272f06647c3d…

MALICIOUS

PDF

38.4 KB Created: 2020-08-17 17:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7dd9cce468783aa94282b8057f275ff SHA-1: 41b27bc4eae9c22dac64b27ff5cf42ed1a10804e SHA-256: bc0b272f06647c3de9e56c8f094d5d2438db8b2a4e7d569f6ad5cc028d67f7a5
152 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 pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains hosting other PDFs, indicating a potential distribution or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious.

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=tv+guide+launceston+tomorrow
    • http://files.twistedaardvark.com/uploads/1/3/0/8/130814124/6964cc0a.pdf
    • https://cdn.shopify.com/s/files/1/0434/5754/4342/files/bukoderetul.pdf
    • https://cdn.shopify.com/s/files/1/0437/8578/1405/files/josorodefonumezube.pdf
    • https://cdn.shopify.com/s/files/1/0434/1976/2840/files/22359852644.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/67485075569.pdf
    • https://cdn.shopify.com/s/files/1/0437/4583/7208/files/gubugamoraf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3768/files/92607762432.pdf
    • https://cdn.shopify.com/s/files/1/0454/4213/8262/files/ronejenib.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/53927493682.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3398/files/sirup_belimbing_wuluh.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4503/files/anchor_tag_in_html_with_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7434/files/visefevuvuxamenuwidivob.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/goredigiziwoxiger.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_off0000581a.bin
d75040998c75bf2bc25e511ed3426f9730c532798b2262ed8a89e88c6363136f
pdf-font-stream PDF embedded font (sfnt) at offset 0x581A 5360 bytes
font_01_sfnt_off00006a54.bin
6575254eb4638995b511e12dfdcf546ff69948d7c1bd947894779d23bd84a4ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A54 10128 bytes