Malicious PDF — malware analysis report

Static analysis result for SHA-256 122f36b9264ed58f…

MALICIOUS

PDF

51.7 KB Created: 2020-08-11 13:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e5753f67be14d76a2cf911c326b084 SHA-1: 416d7b9dbef156c079f0e680c6a7a93fe9e3bce6 SHA-256: 122f36b9264ed58f927443767ca3289dbb701cf75bc8db139d86d30f130dac14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many of which point to potentially malicious redirectors like 'ttraff.com'. The document body, though partially corrupted, contains text related to a syllabus download, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicates 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.com/pify?keyword=gsssb+bin+sachivalay+clerk+syllabus+2020+pdf+download
    • http://files.harperperformance.co.uk/uploads/1/3/1/8/131857890/taguzatejipajaxi.pdf
    • http://files.extremechallengepuertorico.com/uploads/1/3/1/0/131070718/908860.pdf
    • http://difafigur.languageexchangecenter.com/uploads/1/3/1/4/131407818/jozotepuzobaza.pdf
    • http://files.urepabroad.com/uploads/1/3/1/4/131437503/vuxozugefimak-vedarunosa.pdf
    • http://files.peelvalleyteampenning.com/uploads/1/3/1/3/131380728/razogizutag_vawekagajakot_vodeg_zomed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.indictrans.org
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lutekalejore.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/789613773.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/29150388563.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/fosefapinavikula.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/ibps_rrb_revised_notification_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/xoguripavil.pdf
    • https://cdn.shopify.com/s/files/1/0454/2077/3544/files/57815644202.pdf
    • https://cdn.shopify.com/s/files/1/0440/3625/9990/files/imagina_3rd_edition_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/27476774775.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/6430328950.pdf
    • https://cdn.shopify.com/s/files/1/0433/4193/8856/files/18233006887.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007466.bin
69aaa385caa8ec36f6f33e4c3e7d3cf28ff7c5d6dd3db8baab71553c40333d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7466 6008 bytes
font_01_sfnt_off000088e7.bin
a4c55b3143cf8fa26c9762c41d2ef78a82388f6651bc8899e084f52fac3c4398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E7 3708 bytes
font_02_sfnt_off0000941a.bin
46091012d8d3804c999c994ffd5ae10c5290d0e16b425dbf3e820e307ff86561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x941A 14728 bytes

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