Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f402b4c9c0a712e…

MALICIOUS

PDF

45.0 KB Created: 2020-09-10 05:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39298b2471e08c20a1f8f67ebb241f2 SHA-1: 1afb67c3a0284403076e589a87dc61f6e6d9446c SHA-256: 1f402b4c9c0a712e28664e68100cf7502aba57372bbb1b48607504f7af22484c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/pify?keyword= blackberry+work+app'. This URL is embedded within the document body, suggesting a social engineering lure to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. 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.link/pify?keyword=blackberry+work+app
    • https://cdn.shopify
    • https://static.usrfiles.com/ugd/7ba596_7ca461ab21ac404cbea3a105f82d95b4.pdf
    • https://static.usrfiles.com/ugd/b11f6d_237651cb991143e4a0c83d48b2ff30f8.pdf
    • https://static.usrfiles.com/ugd/2f3216_17d255024a6e426abe949648280b9c85.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/ordinal_numbers_worksheet_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0440/8262/6710/files/android_one_ui_samsung_note_9.pdf
    • https://cdn.shopify.com/s/files/1/0465/4769/7814/files/aw_free_video_call_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/65208271037.pdf
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/39969424734.pdf
    • https://cdn.shopify.com/s/files/1/0429/7906/6009/files/57379774099.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/lalolizot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugos.pdf
    • https://cdn.shopify.com/s/files/1/0441/2620/8152/files/textwrangler_color_scheme.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/anges_terrestres_affirmez_vous.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_off000072cc.bin
f452a4aef07f89d92bc6304364f8da41ac65e98e449fa93a40114828af3fbf5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x72CC 5196 bytes
font_01_sfnt_off000084a6.bin
9981b3c48cfaa47889aa5acb77c518a9dce3396e6ee0ab533173d72bfe6d6ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x84A6 10120 bytes