Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbcf4bbc66cd25c…

MALICIOUS

PDF

33.8 KB Created: 2020-08-20 23:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3511edce53588bc1b6cade9254b111 SHA-1: 2031829648c9506b9a98dca9360668b15ebef850 SHA-256: abbcf4bbc66cd25c464fb1bfb5ac1be5cd4ab85e9bb4c0565f6d87e58978fde0
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to the presence of multiple links pointing to known malicious redirector infrastructure and a large number of external PDF links, characteristic of SEO spam or link farm abuse. The ML classifier strongly supported this finding. The document body contains obfuscated text and URLs, including a link to 'ttraff.com', which is identified as a 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.com/pify?keyword=alan+wake++xbox
    • http://files.ronwozny.com/uploads/1/3/2/6/132681409/zutugab-vonapegizatu-lagawixituseba.pdf
    • http://files.ceilingfanhk.com/uploads/1/3/1/4/131406337/9248304.pdf
    • http://files.bethlehemhousewma.org/uploads/1/3/0/8/130813783/f819faa40f342fa.pdf
    • http://files.shandsschool.org/uploads/1/3/1/4/131437982/nebirumesovevi_gotatape_jamepugav_tabovogigopomow.pdf
    • https://cdn.shopify.com/s/files/1/0429/4003/9324/files/tryndamere_build_s6.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/wuxokudaxikawojopefiwunul.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/amontillado_fs.pdf
    • https://cdn.shopify.com/s/files/1/0432/7640/2854/files/rugasugamujopenekel.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/horario_bus_malaga_algeciras.pdf
    • https://cdn.shopify.com/s/files/1/0431/0682/8441/files/55347082375.pdf
    • https://cdn.shopify.com/s/files/1/0436/7079/8489/files/kanubumulefilubidomose.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3846/files/sopuxolowazulatabixen.pdf
    • https://cdn.shopify.com/s/files/1/0433/5167/0943/files/ziwufuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2313/files/ladofabozadebetofeg.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_off00004a3f.bin
766beffd3066d02b1ed82e181fea1e0ae48a8cb165ad26775525f8c30b0df8f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A3F 4760 bytes
font_01_sfnt_off00005a99.bin
53bafe6ab3217d83f89fd94ecde4d361eabd8d7710bd8244a6b45aef4d4c75d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A99 9680 bytes