Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a91d1b3a988e0d…

MALICIOUS

PDF

52.1 KB Created: 2020-08-07 15:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1b132000373b621a932b5bbd31bb08 SHA-1: ed5d2304d19afcf326c7f0f2e1b55f3be6e2345d SHA-256: 07a91d1b3a988e0d7aa978d11c100fe2ae8b47bb126c1308899d52b60708b604
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=ajax+request+download+file+pdf'. The document body also contains this URL, suggesting an attempt to trick the user into downloading a file. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent, likely for phishing or malware distribution.

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=ajax+request+download+file+pdf
    • http://files.wellsmusicpublishers.com/uploads/1/3/0/7/130776142/7550875.pdf
    • http://files.eastcobbyankees.com/uploads/1/3/0/9/130969231/vetap.pdf
    • http://files.kathypoelker.com/uploads/1/3/1/8/131856012/8f64ce85.pdf
    • http://files.covdeinzeeeklo.com/uploads/1/3/1/4/131453247/mugizarixepokowus.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/fegupojebepuri.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1252/files/jurnal_alkalimetri_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/xowuvinitolorokitezegobu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1736/files/21097825898.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1318/files/30110808337.pdf
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/xiwukilobitixug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/kaxifetogir.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/95279005819.pdf
    • https://cdn.shopify.com/s/files/1/0431/6600/7445/files/kerodepenud.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/vusoxuxujasidab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/kejuzoboz.pdf
    • https://cdn.shopify.com/s/files/1/0435/7128/2079/files/bebikaworitexurobanus.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/south_west_gauteng_college_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/8311745938.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6463/files/asterix_and_obelix_the_golden_book.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000728a.bin
6ec74330dfe9d288ada4a4831c1ba2d66aa6da4be7271dc9d8008ce7438c8d5a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x728A 15612 bytes
font_00_sfnt_off0000600f.bin
cc40c7c75578ce3a6e126b7b8e8c3d49b0a66ed14755a0fdc096dbf5a9894a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600F 5384 bytes
font_02_sfnt_off0000964c.bin
1ac97694e03c96b75113b9492f723a53173b4745ca20be9b5f08ef28b136ac71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964C 13944 bytes

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