Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9677fcbbe617c07…

MALICIOUS

PDF

75.6 KB Created: 2020-07-30 22:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c91c590edc8aa0d5e76c3e60223e311 SHA-1: 870b4698f6fafa2c1b08871df56919921ce590cc SHA-256: b9677fcbbe617c07cd706c247c73ef7cbc2e440b448e26ad6e2d46e91a4390f3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a link to a PDF about "physiology of color vision". The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, but the presence of the malicious link is the primary indicator of compromise.

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=physiology+of+color+vision+pdf
    • http://files.slcsupplychain.com/uploads/1/3/0/9/130969663/effe3eda5.pdf
    • http://files.paistethailand.com/uploads/1/3/1/3/131378838/d762468717ca0f9.pdf
    • http://files.templeenterprises.com/uploads/1/3/0/7/130775032/7543370.pdf
    • http://files.mapleridgechristmasfestival.com/uploads/1/3/0/7/130776304/16c82bc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/nilikonujekes.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/93125875796.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/nedugapebubidegidoduvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4583/files/32908491940.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8423/files/gamevepul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/76717316421.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/34545659818.pdf
    • https://cdn.shopify.com/s/files/1/0441/3263/0680/files/79192829946.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/xejakamelaram.pdf
    • https://cdn.shopify.com/s/files/1/0430/3391/9645/files/192971247.pdf
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/zovosefuxaxanawitozixam.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/vezirisodenurapik.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_off0000ec04.bin
cfdb01837daec57c8c1a4ccc5c03ee296b1cf9409f976087ec17ca6e531f89a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 4960 bytes
font_01_sfnt_off0000fcd3.bin
8f109d2ecdce33e485af0319f816d8263ab7df42f14f69b2b2195f26afa0b80f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 10752 bytes