Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe27c2550904e140…

MALICIOUS

PDF

55.8 KB Created: 2020-08-09 20:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f8fb6501e17e4ea2514b0a7d9ba9a29 SHA-1: 9866c51a9ef76a25f80623eef66e4329788b6b17 SHA-256: fe27c2550904e140b404c80fe55f8e0a910a90c9992d62620006fa7cf0f94205
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The embedded URL 'https://ttraff.cc/pify?keyword=bart+route+map+pdf' is a known malicious redirector. The document body, though heavily obfuscated, contains text that suggests it is masquerading as a 'Bart route map pdf'. The ML classifier also strongly indicated maliciousness.

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=bart+route+map+pdf
    • http://degojap.candicelindsay.com/uploads/1/3/1/8/131858661/6e028654a2.pdf
    • http://files.lucette-bijoux.fr/uploads/1/3/1/6/131606733/rutirere.pdf
    • http://files.artistginasouthgate.com/uploads/1/3/1/4/131453695/vaseji-zidajunojupuf.pdf
    • http://files.titanjudo.org/uploads/1/3/0/8/130873795/7f8a5d.pdf
    • http://files.mgrantmedia.com/uploads/1/3/1/4/131437891/65a21aa2072b5.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/67700628044.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/35553620430.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5638/files/gerimofijavanimimozaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/butobisenikowoboriz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/norepokaxubosevobu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1092/4437/files/plotting_coordinates_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1558/files/lagapuvepipofodijaleve.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/86746728838.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/24575898436.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/gukize.pdf
    • https://cdn.shopify.com/s/files/1/0437/7447/6440/files/zuxaxumewejaboloru.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0674/files/fudovepatufobup.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/89246742686.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_off00009db7.bin
abb5fc2842e964a7326f1e3be09ea8602bcb48f7d2cfcb7308eaa9a78262b638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB7 5028 bytes
font_01_sfnt_off0000aebd.bin
7371fc5af89c6fed807f541b5086784b0a6a258192ecebc5cc906108ea52df0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 10276 bytes

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