Malicious PDF — malware analysis report

Static analysis result for SHA-256 0404f1f8c42160e2…

MALICIOUS

PDF

47.8 KB Created: 2020-08-23 04:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a18dcbe31c4811b096b6b702c5a52ae0 SHA-1: 4e66bd1fdf058a8e8ebea5c246ca180bc2136b0e SHA-256: 0404f1f8c42160e2c57f5edf8f41e461d0229c3da955a8fdff6da740c1a081cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a reference to a LinkedIn post image size guide, suggesting a lure to entice clicks. 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.cc/pify?keyword=linkedin+post+image+size+guide
    • http://files.artbyhaven.com/uploads/1/3/0/7/130775808/rixoweza-wimosodupafuf.pdf
    • http://wuwumos.annegreycollective.com/uploads/1/3/1/0/131070305/7120523.pdf
    • http://karujo.bethelkhrihfabu.com/uploads/1/3/2/7/132712615/piwibavele-ramubaxu-banulataba.pdf
    • http://files.wendyvarga.com/uploads/1/3/1/6/131606605/b1ac6da.pdf
    • http://files.casparmckeever.com/uploads/1/3/1/4/131438449/ca906f12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/julobowosefapuvebemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9848/files/compare_2_excel_spreadsheets_for_matches.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/62869193061.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60359225188.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/54950540200.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/58348829205.pdf
    • https://cdn.shopify.com/s/files/1/0437/7883/4583/files/baxopibovipudume.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/48018513286.pdf
    • https://cdn.shopify.com/s/files/1/0440/2325/1094/files/achilles_tendon_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0466/3479/5173/files/annexure_n_for_passport_in_word_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/22669743627.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/centrelink_proof_of_identity_forms.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_off00006f53.bin
53be75dd9ebc9e925e89360db8726e976c4b83b7e94723c5061c98203c69c560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F53 5088 bytes
font_01_sfnt_off00008092.bin
f06e05e367c4c7dab1f63a47ee16084b699be6c0c94ed6db2bc8fff1c4045191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8092 10288 bytes
font_02_sfnt_off0000a3be.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BE 4324 bytes

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