Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6f3b69e214721d…

MALICIOUS

PDF

45.5 KB Created: 2020-08-18 14:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c80bdd6c41f621e77dbdd70752dce4a SHA-1: 2cab98333a97d52fe68245e202b464516e224362 SHA-256: 3b6f3b69e214721de85fa9bd1265fcf216df4e5902b77f6dcec418e2e011797e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to ttraff.com, a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Final fantasy 8 bahamut guide' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=final+fantasy+8+bahamut+guide
    • http://files.bejustalittlebetter.com/uploads/1/3/1/3/131384081/lasovilugiw.pdf
    • http://dadaso.betinaduro.com/uploads/1/3/0/7/130739624/rifawekefigito_gemeworepobej_kenef_nunove.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/lugusit.pdf
    • https://cdn.shopify.com/s/files/1/0434/1936/9639/files/wing_chun_techniques_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78299439052.pdf
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/zefinuvema.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/beratervertrag_muster.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/aadhar_card_online_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/ielts_academic_reading_practice_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0451/7547/2279/files/susifadeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f15.bin
f5ec986226c874d7a6f87f0604038adb117ce7e6a078a17f7a4e2089e8dc08c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F15 5388 bytes
font_01_sfnt_off0000713a.bin
3384d8a9270de2d38ef0c84e69650a039e9091abd49e89024d9afef7bceaac34
pdf-font-stream PDF embedded font (sfnt) at offset 0x713A 12880 bytes
font_02_sfnt_off00009b0a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0A 4324 bytes