Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d42f04cc9d9064f…

MALICIOUS

PDF

60.2 KB Created: 2020-08-12 00:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9135c213daaf17d97a49946e66d598 SHA-1: ea35417220ae712fcf1b4f3940e5961fc807a576 SHA-256: 8d42f04cc9d9064fe2b45e83520f9c6b170cdb08261b974d009d90106b8e9a75
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 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a 'B. sc 2nd year chemistry book pdf' and the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a social engineering lure to trick users into clicking the malicious link.

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=b.+sc+2nd+year+chemistry+book+pdf
    • http://files.mishibloom.com/uploads/1/3/0/8/130874535/wuzobonigatan.pdf
    • http://fixosifip.peezda.com/uploads/1/3/1/8/131856185/kenokonezirun.pdf
    • http://files.embcmanning.org/uploads/1/3/0/7/130740211/pesavabowebekuv_rufaguje_wifunodoxuni.pdf
    • http://wofusosam.5starbuild.com/uploads/1/3/0/7/130776257/b467bad7.pdf
    • http://jidit.aglimpseofhues.com/uploads/1/3/1/4/131454696/kexudusajep_divib.pdf
    • https://cdn.shopify.com/s/files/1/0450/7874/1155/files/anesthesia_and_analgesia_in_laboratory_animals_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9349/files/87552226054.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/88549273621.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3453/files/14479217095.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7938/files/nuxoxidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/61946825927.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/18319754798.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/wakejunuvifipabi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/bojulufemuzegol.pdf
    • https://cdn.shopify.com/s/files/1/0452/7433/3346/files/10349121552.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/rukhmar_flight_path.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/census_survey_in_research_methodology.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cdf.bin
68901f1d191fdc4ed9d6ac3cc3ccea5cd9be125e6d8a6d1006734f5472017dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDF 5884 bytes
font_01_sfnt_off000090b2.bin
55635b50bad29c6b04cd9b4d5dd064b78be6c29eafc981c666da6fe4470a6799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B2 3204 bytes
font_02_sfnt_off00009da2.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA2 2320 bytes
font_03_sfnt_off0000a7f2.bin
8bee04ac87b6eb7913bc5944a0314b108dc9f8a6afb74295826324176ec81268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F2 11392 bytes
font_04_sfnt_off0000cd41.bin
4362e686776cae9b5e877a8e5de4a1ff5ae9966626bcf1046762b8e3a01bbea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 16224 bytes

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