Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f805c619f53bdd…

MALICIOUS

PDF

57.3 KB Created: 2020-08-07 05:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29f860138a4393e3b541aaf5762024fe SHA-1: 4a2e5d81d3cc434f746819aa6021ab5d1a7b462c SHA-256: f8f805c619f53bdd1d26cae253ed2561fc21d90763a34f3ec3ecd50accb565e5
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'jam mathematics syllabus pdf' and a URL pointing to 'ttraff.com', indicating a lure to a malicious site. The presence of a large number of external links, many pointing to Shopify domains, suggests an attempt at SEO poisoning to drive traffic to malicious infrastructure.

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.com/pify?keyword=jam+mathematics+syllabus+pdf
    • http://files.celebrationonwells.com/uploads/1/3/1/4/131407423/zanokunozumogexobidu.pdf
    • http://kajif.cypbb.com/uploads/1/3/0/9/130969204/6587726.pdf
    • http://files.marsjoyofpainting.com/uploads/1/3/1/6/131606127/1986964.pdf
    • http://files.childsafefence.com/uploads/1/3/1/3/131383982/4c18eab7.pdf
    • http://zoguwoki.medicinemakermama.com/uploads/1/3/0/7/130740013/85609284aaf6d.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/asciidoctor_image_to_embed_not_found_or_not_readable.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/kisogusuzejiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/35807136741.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/xozoragiguram.pdf
    • https://cdn.shopify.com/s/files/1/0440/5772/3030/files/dragon_magazine_313.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/building_construction_by_rangwala_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/0835/8561/files/minecraft_orespawn_mod_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/woputapejasazewimal.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/fiwujidurasotez.pdf
    • https://cdn.shopify.com/s/files/1/0431/6138/7170/files/91753424865.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/80959622430.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_off0000a227.bin
cf1097904ecb24a5ca3c4b32ac678e075e0d078dd8b10dcf1506af83a0045158
pdf-font-stream PDF embedded font (sfnt) at offset 0xA227 5528 bytes
font_01_sfnt_off0000b4da.bin
adbadc07ced656ebafe944ca612125c274bb7af2131809ce4eb5949fabfe6dc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 10376 bytes