Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ab9f4c641c12da…

MALICIOUS

PDF

63.3 KB Created: 2020-08-03 13:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 091d0d9f2a4ab1d39d38c49d71b2caa0 SHA-1: 04c364a6d9a6954808332d4e261855240215057e SHA-256: f7ab9f4c641c12da77ceb981c506c429033d3d59f234f18ccff756464919d0c6
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to the presence of numerous external links, a technique commonly used to create SEO link farms. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=centroids+and+centers+of+gravity+pdf'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to lure users to this malicious redirector.

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=centroids+and+centers+of+gravity+pdf
    • http://files.killingtonwinefestival.com/uploads/1/3/0/7/130738799/tatifajuk.pdf
    • http://files.inspirationplantation.com/uploads/1/3/0/7/130775363/tetawiwegu.pdf
    • http://files.hafidhsafaris.com/uploads/1/3/2/7/132740930/b1db6548.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/zugaradeworu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/6418936319.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8709/files/lefaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/jolekusepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8642/files/zevudexewet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2650/4086/files/sowonegoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/vopixonipabipivovo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5488/3231/files/kupibekonevamokako.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3435/files/76839932954.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/22129878875.pdf
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/70611905383.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23158701460.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000955d.bin
2d524bf169219fe13404e911f48d09d0b8c9724972eab5940fc46f4779fae142
pdf-font-stream PDF embedded font (sfnt) at offset 0x955D 5356 bytes
font_01_sfnt_off0000a7b3.bin
d408b9b92f9f3759c38be50fe797797e433d210c8d2cb49183be505ddef7bd92
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B3 16320 bytes
font_02_sfnt_off0000da98.bin
fa232f5f1b6658b765295dc7bc90c6f0e5d967f79858d6d8baf72ef7ab45008e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 16168 bytes