Malicious PDF — malware analysis report

Static analysis result for SHA-256 497be3bdae02f187…

MALICIOUS

PDF

45.2 KB Created: 2020-08-18 22:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb51a110a02cd4c33671348136e84d0d SHA-1: 8680d1139abeebb41978e57c4e108e248b5626fc SHA-256: 497be3bdae02f1874a53eb01707193542a667bc6954b25dfb3ba17e56f773bbd
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains numerous embedded URLs. One URL points to a known malicious redirector, and the document itself appears to be a link farm designed to distribute other PDFs. The primary malicious URL is https://ttraff.ru/pify?keyword=bancroft+and+district+regional+mineral+collecting+guidebook, which is likely used to redirect users to a malicious site. The presence of multiple Shopify-hosted PDFs suggests an attempt to blend in with legitimate content while distributing malicious links.

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=bancroft+and+district+regional+mineral+collecting+guidebook
    • http://files.megastarphilippines.com/uploads/1/3/0/7/130739264/4967374.pdf
    • http://debujixus.tailwinddelivery.com/uploads/1/3/0/8/130873998/minex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/75438615377.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/vinoruba.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4127/files/anatomical_terms.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/55336244545.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/bajawavorupinaraduseruwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/7217/4745/files/22453360562.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/74801155284.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0298/files/stay_with_me_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/fotegem.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/fasegiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/nugitofux.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/12359457966.pdf
    • https://cdn.shopify.com/s/files/1/0431/0804/0853/files/sameva.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/pelabagemab.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_off0000709b.bin
6767a8e77ad7d64e051dc3302982e0c4faed0ea5cde8344a272fc2ca522060ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 5592 bytes
font_01_sfnt_off00008384.bin
7144d5ce6de10e3a9715a51b94df118b3dad091b6f77c3ce865e7da00bddb0a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8384 10468 bytes

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