Malicious PDF — malware analysis report

Static analysis result for SHA-256 d831afc831476f49…

MALICIOUS

PDF

41.6 KB Created: 2020-08-17 07:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cccda6f93c25cb8dc0157d9f248edf7d SHA-1: a6a00216e2f70781aa13295e9f0e5078abf3ecae SHA-256: d831afc831476f4977cca0760f76714ed0b65f3bc2c44023fa27228505ff50ed
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=high+graphics+android+racing+games, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to trick the user into clicking the malicious link, likely leading to further malware download or exploitation.

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=high+graphics+android+racing+games
    • http://foxidegag.cusunique.com/uploads/1/3/2/6/132695478/nogodif-lejozunusa-divipobug.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/fifty_shades_of_gray.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/sojibarel.pdf
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/todaruduvo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/44910490972.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/kodi_on_apple_tv.pdf
    • https://cdn.shopify.com/s/files/1/0435/8048/9891/files/xujafef.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/expediente_anunnaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6073/files/nojifobipepejodomobav.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/29706279230.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/waweka.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/26505508527.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/ninavaxejonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/99558164225.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_off000064bf.bin
8c7f0f4dbe9190728d433fa01f3bb698fb0731d6b2531d70c4403447052f04e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BF 5416 bytes
font_01_sfnt_off000076f4.bin
9397b4aa5665b2fd6d915eade3067ef74cfdcf3a6edb3c4cadcf6b1370472a19
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F4 10212 bytes