Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd55aca9b2b8fe84…

MALICIOUS

PDF

48.2 KB Created: 2020-08-12 00:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f32b6a5b83eb7e44dd055247bdcd968d SHA-1: 812178e03d8228d2dd536c04b92bfa2c7873d65b SHA-256: bd55aca9b2b8fe840c2244174123267da25685c04da2a032d782eb466a35af2b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one primary link directs to a known malicious redirector at `ttraff.ru`. This suggests a link farm or SEO poisoning tactic designed to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=benim+hocam+vatanda%25C5%259Fl%25C4%25B1k+video+ders+notlar%25C4%25B1+2020+pdf
    • http://mimon.ucasadh.ie/uploads/1/3/1/3/131379992/94050.pdf
    • http://files.boothfolio.com/uploads/1/3/0/7/130775590/witavo.pdf
    • http://files.buyunladylike.com/uploads/1/3/1/3/131381109/f48c37a47eca2e.pdf
    • http://files.lifeatthelandlab.org/uploads/1/3/1/6/131607407/fawudema_rixusob_vajotawumi_papiduji.pdf
    • http://letuwirez.whimsycodesigns.com/uploads/1/3/1/4/131482975/penojenud.pdf
    • https://cdn.shopify.com/s/files/1/0431/0525/5586/files/buckminster_fuller_critical_path.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/wutelezago.pdf
    • https://cdn.shopify.com/s/files/1/0451/3277/5589/files/modern_automotive_technology_james_e_duffy.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/emojis_copy_paste.pdf
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/nosomazibajupej.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/gojesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0445/6343/1588/files/best_books_to_read_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/pukivezuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lovukapovilelogitolosir.pdf
    • https://cdn.shopify.com/s/files/1/0432/5900/3038/files/19309020362.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/nitrogen_fixation_by_lightning.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/zizulolodapa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/90879257240.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005422.bin
d450255c4d1af218e976cb2cace8648a47d1a95cf111ef123a4fab0a0a4ceaed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5422 5912 bytes
font_01_sfnt_off0000678b.bin
522006722cb7e3a50f512fad1e71543acb681461ce036ced2ca34294e64d82ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678B 11796 bytes
font_02_sfnt_off00008c75.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C75 16312 bytes
font_03_sfnt_off0000a200.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA200 4324 bytes

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