Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f4ba8728ed6796…

MALICIOUS

PDF

43.6 KB Created: 2020-08-23 03:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5226d11e3d401777a28d1413d3a6387d SHA-1: 30d0ad3b1f7df6e8e9d2c7d7a0e74f8dcabf9ee5 SHA-256: 62f4ba8728ed67962ca200b6f41768f40a68af5a6bc8f810a1e41bbb40918dfb
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=diagn%25C3%25B3stico+de+anemia+falciforme+pdf'. The document body, though partially garbled, also contains this URL, indicating a likely phishing or malware distribution lure. No scripts were extracted, but the presence of embedded URLs and the malicious redirector link strongly suggest an attempt to redirect users to malicious content.

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=diagn%25C3%25B3stico+de+anemia+falciforme+pdf
    • http://files.emilytodt.com/uploads/1/3/1/4/131406785/99e03c7b28a8e23.pdf
    • http://files.braaibeque.com/uploads/1/3/0/7/130775174/3392100.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/41907306845.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0357/files/79508919745.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/teclado_espaol_mexico_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/bleacher_report_nfl_predictions_week_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/57928111422.pdf
    • https://cdn.shopify.com/s/files/1/0439/3703/8491/files/little_brown_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0446/0858/5891/files/binary_large_object.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4859/files/pinajawuxepoba.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/78774187674.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b2.bin
52620ae4f169658e1977df32aa264574c9bc949f3642e48c414dd18b662c5783
pdf-font-stream PDF embedded font (sfnt) at offset 0x68B2 5608 bytes
font_01_sfnt_off00007b70.bin
e8586e5994f405eed70c285a5b042afeed1ea6f13bd32d1c701b6ed8f5f93bb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B70 11132 bytes