Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb92ffbb492a04da…

MALICIOUS

PDF

45.8 KB Created: 2020-09-30 14:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e3cebb9d774c9b0df4fd58c5980a7a26 SHA-1: bea98d768a3e580565b82a9d6f077acac3a51c48 SHA-256: fb92ffbb492a04daae2d523a6d7224c4777e73fd3a94eaf71f9f2699e4204d82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious content via a link within the document.

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://gettraff.ru/strik?keyword=abatement+of+suit+pdf In PDF document text
    • http://files.seanhancocklive.com/uploads/1/3/1/4/131437532/3135269.pdfIn PDF document text
    • http://files.thecollegeidcamp.com/uploads/1/3/1/3/131381602/jifuwoxedavagevax.pdfIn PDF document text
    • http://files.mgetsinslp.com/uploads/1/3/1/6/131637316/podanobabi.pdfIn PDF document text
    • http://lexirux.pro1inspection.com/uploads/1/3/1/3/131381428/kupefobakagexod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/indexbom_bse-_smlcap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1771/4338/files/after_effects_cs6_shortcut_keys.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/beautiful_oops_art_activities.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/alchemy_skyrim_guide_leveling.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/40360319037.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6906/3836/files/cover_letter_for_report_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/musul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8839/3893/files/dapakimijozem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5253/0845/files/pozunulobogaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/cursive_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/24283176722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/runisefiluwam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/guidelines_for_administering_im_injections.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/52085923534.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/6574/5054/files/luluwuno.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000687d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687D 5072 bytes
SHA-256: 6f4c1da3434f1321c10235f49a8a08c4ed04954c6756c1b0b0f33a9dcd4bfc09
font_01_sfnt_off000079a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 10040 bytes
SHA-256: 6cbce454c5b6deffa8805e08df577c0b15bb2e9903036f5cdaaab7c8068d594c
font_02_sfnt_off00009bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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