Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce28afb7003b549…

MALICIOUS

PDF

41.7 KB Created: 2020-08-16 12:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9d6ccf2ccf13f8da9bbfb3d419a45b SHA-1: 6f42e0ffed06514920a4b5ada7b02a082865e76b SHA-256: fce28afb7003b5496edcbdd35f41470f62e5071a618796558fd75614a6350d5e
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many hosted on Shopify, designed to create a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=kiedy+android+9+na+lg+g6'. The document body, though heavily obfuscated, contains this same URL, indicating a likely attempt to redirect the user to malicious content. No scripts were extracted from this sample.

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=kiedy+android+9+na+lg+g6
    • http://files.hamptonlinks.org/uploads/1/3/2/6/132682640/gozukej_zebufu_nopub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/rizojavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/badminton_score_sheet_doubles.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/77321013099.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/onerepublic_dreaming_out_loud.pdf
    • https://cdn.shopify.com/s/files/1/0427/4470/9276/files/96972962730.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/today_sandesh_newspaper_ahmedabad.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/59129887209.pdf
    • https://cdn.shopify.com/s/files/1/0441/2804/3160/files/ladus.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/ascendance_of_a_bookworm_manga.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/application_letter_for_nursing_job.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/64562695443.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_off000065d0.bin
72c752902c7e1036e3eba43d49a049acb0cc88a4b77f207c03c9f3048c7c883f
pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 5196 bytes
font_01_sfnt_off00007791.bin
7cc62ea7e49e65f9670a5e921a0a1e53f1151c0d6e60261f0dc7333be0132e99
pdf-font-stream PDF embedded font (sfnt) at offset 0x7791 10156 bytes