Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d74b6ac75bdcc17…

MALICIOUS

PDF

48.6 KB Created: 2020-08-08 12:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 103f1a00505ec79e63b7100ffd28f202 SHA-1: 26a77a13da500018daf5bdc0935ed04c35ec7b41 SHA-256: 4d74b6ac75bdcc17373f90ebe1be9f4aadf4d02d5b266bdd6a855425c06cf5ab
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create SEO link farms or to distribute malicious content. One of the extracted URLs, 'https://ttraff.cc/pify?keyword=taxonomies+of+learning+pdf', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct execution capabilities.

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.cc/pify?keyword=taxonomies+of+learning+pdf
    • http://sabawit.venusdirections.com/uploads/1/3/1/4/131408027/nobafelogizesa-xemaviwivojina-rorediz-nixuf.pdf
    • http://files.pigmansproduce.com/uploads/1/3/2/6/132681916/fufefopinejazikapaju.pdf
    • http://files.performancearthouston.com/uploads/1/3/1/4/131437093/651853.pdf
    • http://files.ryanshay.org/uploads/1/3/1/8/131859261/jopulekenuw_mabisefamaxuza_nawirovoxemi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/ninja_turtles_torrents.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/zasutokovamemisoxikasa.pdf
    • https://cdn.shopify.com/s/files/1/0446/9299/6252/files/protection_against_domestic_violence_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/89786911232.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/oxford_word_skills_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/beatles_anthology_1_booklet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/past_simple_regular_verbs_pronunciation_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4344/files/34696416746.pdf
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/duriwajozolopemu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1743/6327/files/zoxulamo.pdf
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/makkar_ielts_speaking_cue_cards.pdf
    • https://cdn.shopify.com/s/files/1/0438/2985/4368/files/99115221403.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/50861512056.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/kenojigo.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/
    • https://cdn.shopify.com/s/files/1/0429/2060/7900

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068ef.bin
8ddf9b988a9093ec6da86e21b5565239e2cd832deb91a9e35a70ad8857485c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 5084 bytes
font_01_sfnt_off00007a1c.bin
6885ddab86655dd78a30d50eac621654398da718178781cecf167cba4dbf8fd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1C 14300 bytes
font_02_sfnt_off0000a703.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA703 4324 bytes

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