Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a91ac38fdbe17b…

MALICIOUS

PDF

46.0 KB Created: 2020-08-24 03:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2d1b2d092356ad52dd0bf382b13c0e6 SHA-1: 6c66a0859f3ea5078eba882768d940717332c01f SHA-256: 48a91ac38fdbe17ba5ac49eb19b24c0a71f62e1f87c91a2d405937de21187cfd
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=autocad+2018+tutorial+free'. Another critical heuristic identified a PDF link farm, suggesting SEO manipulation to drive traffic to potentially malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and other Shopify links, some of which are confirmed benign, but the presence of the malicious redirector is the primary indicator of compromise.

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=autocad+2018+tutorial+free
    • http://renaza.toprodbassmasters.com/uploads/1/3/1/3/131398405/xanemojag-jumozenugop-kuboligiwi-dasaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0461/7034/1528/files/bubefokigowarexeromis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/derilujepevatesixirur.pdf
    • https://cdn.shopify.com/s/files/1/0433/4072/6427/files/legotogojiwufiwavipubot.pdf
    • https://cdn.shopify.com/s/files/1/0458/1408/7846/files/ansible_template_create_destination_directory.pdf
    • https://cdn.shopify.com/s/files/1/0437/6533/4165/files/majowaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/honda_model_hrr216k9vka.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/auditoria_ambiental_ecuador.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8734/files/theoretical_framework_about_absenteeism_in_school.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/chloride_ups_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/zarilo.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_off00006a68.bin
3e5200f554615940edcf144f84d92473ac259d0cd7dcedcd91d5b3f87f02c560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A68 5124 bytes
font_01_sfnt_off00007bdf.bin
c1a4abfdafd893210d35806140998e75ca6c8cb3a27b070ee15820723a83981e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDF 9716 bytes
font_02_sfnt_off00009d1a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1A 4324 bytes

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