Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91c8ca56e5da101…

MALICIOUS

PDF

44.9 KB Created: 2020-08-24 05:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f364cfe195761a8a667e0172e8390f00 SHA-1: 23d94fc32d27bc9686a398d39ea301517cdd1f08 SHA-256: e91c8ca56e5da101b5aee70c32771fcde56c9c00a163c0b3a0c8e0ea7266cb95
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one identified as a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, contains text related to a 'marksheet' and includes the malicious URL, suggesting a lure. The presence of a PDF link farm heuristic further indicates an attempt to distribute links to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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=marksheet+of+class+10+2018+fbise
    • http://files.narrativeimaginings.com/uploads/1/3/1/3/131383386/jimavilokodini-gifumowutomoju.pdf
    • http://files.nmsfamilycenter.org/uploads/1/3/1/8/131856602/8343195.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/pefurofisekiti.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/bergey_s_manual_of_determinative_bacteriology_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0468/9558/files/brown_dust_mod_apk_1._43._7.pdf
    • https://cdn.shopify.com/s/files/1/0433/3607/3366/files/rovezuvaru.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/42281526496.pdf
    • https://cdn.shopify.com/s/files/1/0431/5296/5792/files/characteristics_of_aerial_photographs.pdf
    • https://cdn.shopify.com/s/files/1/0440/8541/1990/files/81874617780.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/doing_research_in_counselling_and_psychotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/fupilelujibixefabituk.pdf
    • https://cdn.shopify.com/s/files/1/0443/8743/4662/files/ashampoo_photo_commander_16_handbuch.pdf
    • https://cdn.shopify.com/s/files/1/0436/1909/0595/files/79813464839.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1325/files/68406722958.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_off000063a0.bin
77ce18fcceaf0418ea93317279add81d4c67d879c8af94dbacf7e57261d3763e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 5380 bytes
font_01_sfnt_off00007602.bin
54524251f8f52224063ee036b525520fb83df94c5fef3118c72f30323fafb2c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7602 10044 bytes
font_02_sfnt_off00009830.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9830 4324 bytes

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