Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b54f1304488f948…

MALICIOUS

PDF

50.2 KB Created: 2020-08-25 06:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ef36eece03bfc6548dbb397a7ef55c4 SHA-1: 31daa5e65eef340ccacb65abb3f5fe5de894db3b SHA-256: 1b54f1304488f948fd640c5e068b1f9f4630598bd2177ed90f8daf1705672ebc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments that, when combined with the heuristic firings, suggest a lure to a malicious site disguised as an answer key. The ML classifier 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.ru/pify?keyword=puzzle+fuzzle+answer+key
    • http://jovolas.fbcrecreation.com/uploads/1/3/0/8/130874359/8227017.pdf
    • http://files.kellydumont.com/uploads/1/3/1/4/131410545/vebor-gotepage-rododisafinev-bomopupi.pdf
    • http://talomari.electthebeard.com/uploads/1/3/2/8/132816036/mufubezu-pezan.pdf
    • http://files.dopenailz.com/uploads/1/3/2/7/132741382/e780055.pdf
    • http://files.schatziesevents.com/uploads/1/3/0/7/130739621/kerojuwe-jibexim-jipotoworutew-ralugomenasofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/job_interview_question_and_answer_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/99250218931.pdf
    • https://cdn.shopify.com/s/files/1/0432/9914/3838/files/sotejanil.pdf
    • https://cdn.shopify.com/s/files/1/0432/6126/4035/files/abox_android_tv_box_reset.pdf
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/biologically_inspired_robots.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/gigoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9957/files/neat_scanner_software_alternative.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/liwetabamopabuwijupapipan.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5656/files/business_chinese_language.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/the_bedford_reader_13th.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/apuntes_perspectiva_caballera.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9891/files/72930359648.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006442.bin
f0505265f9f25be00d99694166fbf53e1a6be296dd5010b352115ec73ef41739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6442 4712 bytes
font_01_sfnt_off00007469.bin
c93d6f0f5783acb8b9aa4495fb2b586a0e11e4fe19a6263e0330d9b59fc84827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 10240 bytes
font_02_sfnt_off000097a8.bin
844cb084336e143bceaacd7de948136837ca80d958068760f33a7e0e858d23f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A8 16320 bytes
font_03_sfnt_off0000ad36.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD36 4324 bytes

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