Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fa826a7795eb50…

MALICIOUS

PDF

56.7 KB Created: 2020-08-05 04:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1290f53ea62996458ac7d1313b52f34 SHA-1: 8c87ce7c7d3dfa391ddc353a6f9c472d41868bf6 SHA-256: e2fa826a7795eb5036e2367b8c2c5f6460c946d8c3a57bedd854fc32067a783e
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content through a link farm. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=architecture+english+vocabulary+pdf
    • http://files.traceymaye.com/uploads/1/3/1/0/131070362/bidivuxutow-xijipu-pisovibaga.pdf
    • http://files.wretchedmom.com/uploads/1/3/1/8/131871501/kakewokanul.pdf
    • http://files.ambassadorforthebluebirds.net/uploads/1/3/0/9/130969850/gajura.pdf
    • http://files.pilates-journey.com/uploads/1/3/1/6/131637606/paduririr_xudemolume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botezosural.pdf
    • https://cdn.shopify.com/s/files/1/0430/6364/0213/files/aurlien_gron_hands_on_machine_learning_with_scikit_learn_and_tensorflow.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/xivakixilamanevetiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/xijukufijagetinabita.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/17489431091.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/ppap_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0436/2135/1587/files/bsc_zoology_notes_second_year.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/babysitters_black_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/63821247953.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/zarokarur.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/55865371477.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/68790158722.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/11455327287.pdf
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/pdf_file_reader_app_free_download.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_off00009f78.bin
96e45e148eb0063eab4d31bebcdea8bdeb381bc37b5e8cfba37f183dafed1a89
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F78 5708 bytes
font_01_sfnt_off0000b2eb.bin
2bdd5de27a0b506cbd87794a0b8f3b4bef71fc281defd4102ede93fa58b0fee2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 10192 bytes