Malicious PDF — malware analysis report

Static analysis result for SHA-256 242c78037cb7ba0e…

MALICIOUS

PDF

45.5 KB Created: 2020-08-24 02:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa446d8e3ef72ee2719a572378aef14e SHA-1: 2060d0e4547dda260e54f07e51b5e35a34c1a4fb SHA-256: 242c78037cb7ba0e1c317c08396cfac82c8b7598df44aefe9ce760e75b116e83
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=best+acknowledgement+for+report+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and other PDF links, suggesting an attempt to drive traffic to potentially malicious or SEO-spam sites.

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=best+acknowledgement+for+report+pdf
    • http://files.psubaltimore.org/uploads/1/3/1/4/131483002/8dd5f43776f2.pdf
    • http://gekemavud.buhundpuppies.com/uploads/1/3/1/6/131636832/zofuwupugivif_xikumelobagem.pdf
    • http://jasepaj.mathewsdancestudio.com/uploads/1/3/2/7/132740624/5c110e625.pdf
    • http://waxel.westsideestates.com/uploads/1/3/0/8/130814017/zekil.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7201/files/tunnelbear_vpn_apk_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/52644613164.pdf
    • https://cdn.shopify.com/s/files/1/0461/9206/6709/files/film_habibie_ainun_full_movie_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9648/files/homeland_fernando_aramburu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/fixemipib.pdf
    • https://cdn.shopify.com/s/files/1/0463/6019/9323/files/bhopal_shatabdi_express_platform.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/vande_mataram_abcd_2_song_320kbps.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8667/files/clasificacion_de_los_medicamentos_antiemeticos.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/tapuba.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/53246612133.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/bobuzufod.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_off00007520.bin
8aca7c8f150d0421d5f8204d4ad76a33bcdef411d6f9ea7a46e9acf61edbccdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 5680 bytes
font_01_sfnt_off00008871.bin
9c16d6fe12360a8b4f63df5184db0657f615b985d833121ea619f0b1882ad9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8871 9644 bytes

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