Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e644b7df9da270…

MALICIOUS

PDF

61.6 KB Created: 2020-08-11 22:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2460a4846951fd31cd5140c66299606b SHA-1: bef7550f2a1c9e52de01d25991766fb7dd238ad6 SHA-256: f1e644b7df9da270072afbd7e712f3e9ba33afe4023e550d30f4a8eb862c0c52
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=down+s+analysis+cephalometric+pdf'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to PDFs hosted on various domains, including benign Shopify URLs and potentially malicious ones. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several other PDF links, reinforcing the redirection attempt.

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=down+s+analysis+cephalometric+pdf
    • http://kowoxuna.sveaunion.org/uploads/1/3/1/6/131606875/vetesogam.pdf
    • http://files.daughtersofscotia.org/uploads/1/3/0/8/130813146/d27576003.pdf
    • http://files.emilyjaneart.co.uk/uploads/1/3/1/4/131437689/34e7365afec7db.pdf
    • http://files.bristolprivateclients.com/uploads/1/3/2/6/132680932/9272959.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/funetomogaxigiviw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2023/files/kenmore_600_series_dryer.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/amazing_grace_hillsong_chords.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/signs_and_symptoms_of_schistosomiasis.pdf
    • https://cdn.shopify.com/s/files/1/0434/5387/4329/files/gijobadetisokitevaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/71696661389.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685258811.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/avicii_addicted_to_you.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/all_bearing_types.pdf
    • https://cdn.shopify.com/s/files/1/0436/7797/4678/files/gigalokuxafikuwowowo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/erosion_and_deposition_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3996/files/robin_hood_login.pdf
    • https://cdn.shopify.com/s/files/1/0432/0729/5140/files/emt_basic_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6615/files/pumotuxewewefepaxowuxe.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_off0000b14c.bin
1d52229e4e72dd9b703f8294405124c6fe1cdbb334dbd37a3bf9d3b963963142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB14C 5588 bytes
font_01_sfnt_off0000c435.bin
5dc97fcc9fa1c15c9d59242514222e32015313c2e59b77831d0e44459a3c61b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 10932 bytes

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