Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b91dd83bd4f921c…

MALICIOUS

PDF

45.7 KB Created: 2020-09-08 12:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3728517e010ba55b4e309e697134d707 SHA-1: b793b02508e097d092346088aaa59653af89dcd5 SHA-256: 3b91dd83bd4f921c4c659c6d8dff56dae41486357a045fcba18cec4d6c3d9672
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to mask the malicious redirector.

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.club/wix?keyword=greenbottle+blue+tarantula+care+sheet
    • https://cdn.shopify.com/s/files/1/0436/0758/9027/files/balance_sheet_in_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0432/8754/3964/files/jimored.pdf
    • https://cdn.shopify.com/s/files/1/0439/2088/3880/files/creative_brief_template_for_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2695/files/41851139667.pdf
    • https://static.usrfiles.com/ugd/50c35f_77eb1dbf2f71472dad7adff910d506ef.pdf
    • https://static.usrfiles.com/ugd/ee6100_89058267cd774bf3bd25c6cbc63adb44.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc438509ef674caf95ed813883331695.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/hum_aapke_dil_mein_rehte_hain_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/21063386229.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/fivem_color_codes.pdf
    • https://cdn.shopify.com/s/files/1/0444/2020/2663/files/beer_belly_or_pregnant_belly.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/97336321929.pdf
    • https://static.usrfiles.com/ugd/b8c837_49723570578744938ae893b0c9c2b14f.pdf
    • https://static.usrfiles.com/ugd/b910ae_a2adf6fbbdfa421088e1ac24b8e12050.pdf
    • https://static.usrfiles.com/ugd/9edd50_b89fa47a4279427c89a608e1bb6ba3ed.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_off00006d88.bin
e3d7acb0d04c215cba5987198c826eefdf6294871ad659ee5d23ed0d18a53e06
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D88 5056 bytes
font_01_sfnt_off00007eaf.bin
891aa9cb2054583b2a83ca7d91c1b60fa5ff2268e0b4e9eb67e467cf4236381d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAF 13708 bytes