Malicious PDF — malware analysis report

Static analysis result for SHA-256 100a72e951a04990…

MALICIOUS

PDF

53.0 KB Created: 2020-08-07 13:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40b20a4d6099280a1052a5603bee63af SHA-1: 039ec07431557d5daab3c65dd7b4a863c3422677 SHA-256: 100a72e951a04990ca9a8c951d982d43f8916f31afdbe9a8237e49efea690211
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector link pointing to malicious infrastructure, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to a book download, which is likely a lure. The ML classifier also 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.com/pify?keyword=bsc+1st+year+maths+algebra+book+pdf
    • http://files.myworldinanutshell.online/uploads/1/3/1/6/131636808/fojabapenipolox_kijowakapigage_rokol.pdf
    • http://files.wanderfultime.com/uploads/1/3/0/8/130874110/3712ea9ad197.pdf
    • http://files.weneedaircon.co.uk/uploads/1/3/0/8/130814475/7ed813a8b27a15.pdf
    • http://files.bubbleandmimilimited.com/uploads/1/3/1/4/131406348/560ab33.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/gentle_back_stretches.pdf
    • https://cdn.shopify.com/s/files/1/0429/1205/5463/files/64919078984.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/piezas_en_perspectiva_caballera.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/96269895870.pdf
    • https://cdn.shopify.com/s/files/1/0436/4242/1398/files/gapurugitujoduzor.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2743/files/12544897142.pdf
    • https://cdn.shopify.com/s/files/1/0432/5389/1232/files/72236038631.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7093/files/32871560198.pdf
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/ranged_attack_5e.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0942/files/78545891677.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/66923600613.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628e.bin
ed0d7032bfcf7aa699980e41dcb69eb280401712cf2434a8c7b3b46075c35bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 5976 bytes
font_01_sfnt_off000076cb.bin
3ec5eaebde275098412d8dff0e1045b52b4c0e5a23abac5807418a6329e69f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CB 3204 bytes
font_02_sfnt_off000083bb.bin
026de1076dad6614fee7b4839f066e743e4238b5ddea94259138cfcd618330b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BB 2320 bytes
font_03_sfnt_off00008e0d.bin
d9a8ea7d1a3978f5b676ccb9bd23d9f8d73b5361940f39a8ff3f5fad4fa56c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0D 10076 bytes
font_04_sfnt_off0000b088.bin
7a7e0f9cb89785dee93ecfbcc78ef93b5a18a5022886c2d5a0bf15d9412c15a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB088 16224 bytes

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