Malicious PDF — malware analysis report

Static analysis result for SHA-256 39140f3ffd0ba383…

MALICIOUS

PDF

47.9 KB Created: 2020-07-26 20:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 372241c1b3a58606435c61eba0000fef SHA-1: 004e9ce59ef91abd5e36f68191ea58722cfdfbed SHA-256: 39140f3ffd0ba38380a6701a83a4fff59ea0a9f61ce2b822ea59d11d9b120dd8
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'. Additionally, it exhibits a PDF link farm with numerous external links, many hosted on Shopify, suggesting an attempt to distribute or obscure malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'allow pop ups chrome android', which aligns with a lure to trick users into clicking malicious links.

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=allow+pop+ups+chrome+android
    • http://files.cgaynor.com/uploads/1/3/1/4/131454190/3574304.pdf
    • http://files.citybeerwebstore.com/uploads/1/3/2/8/132814980/2716393.pdf
    • http://files.slocampnpack.com/uploads/1/3/2/8/132814791/xulekudefapu-gozom.pdf
    • http://files.pioneervalleywriters.org/uploads/1/3/1/4/131437044/pururis.pdf
    • http://files.nicolereddingtonart.com/uploads/1/3/1/0/131070325/kebesusami.pdf
    • https://cdn.shopify.com/s/files/1/0429/6327/1833/files/74225619568.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/59868026076.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/wesunegalagazovebenok.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/30315700999.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/68633465339.pdf
    • https://cdn.shopify.com/s/files/1/0431/3120/7837/files/54652087413.pdf
    • https://cdn.shopify.com/s/files/1/0430/4971/3817/files/waloneseterusoxinijewuso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/lesarodeloditojifu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/dekaxoliminikowomugizaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/99264289431.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_off00007579.bin
84acdd30c1c4f1c90d3ddcab0fe1e9a40b4ea3d13accb4becf3abd6c8bd1595f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7579 5196 bytes
font_01_sfnt_off000086f7.bin
147d844cc778b3bd17d24ad668c7465ab507087d97f0f601dd9b52433b51bbbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F7 13744 bytes