Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc0d0f26cecbb64…

MALICIOUS

PDF

39.8 KB Created: 2020-08-12 06:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db9c1f747f5e41703fbbb300ad25f12b SHA-1: 3b72a71b1e5fdae8f4cb944f0db0b7f8e2663941 SHA-256: 0fc0d0f26cecbb64160f13e28cfa1b0fd2a4852d272b06b6daa550138d9b81d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body itself is heavily obfuscated, but the presence of numerous links suggests an attempt to lure users to external, potentially malicious, websites. 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=list+of+basic+adjectives+pdf
    • http://files.tulipanproductions.com/uploads/1/3/1/4/131437657/2308318.pdf
    • http://files.bootedmiles.com/uploads/1/3/1/4/131438468/5428990.pdf
    • http://files.healthyexplorer.org/uploads/1/3/0/7/130775607/nosifevakig-jebefasip-zanosu-somalimu.pdf
    • http://faxax.eq-apparel.co.uk/uploads/1/3/0/9/130969723/luvob_zafekefokava_rodikemoxel.pdf
    • http://files.artdecuivre.net/uploads/1/3/1/1/131163590/lukavuru-kazoposureberow-wozewowetiker-kukixatox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/affirmative_tu_commands_practice.pdf
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/az_900t01_a_microsoft_azure_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/95615364909.pdf
    • https://cdn.shopify.com/s/files/1/0435/1003/8683/files/darkness_reborn_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/44948541195.pdf
    • https://cdn.shopify.com/s/files/1/0438/6678/3899/files/63554762764.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/jamifejirobobugivunug.pdf
    • https://cdn.shopify.com/s/files/1/0452/5555/7282/files/brocade_san_switch_configuration_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/phonics_dance_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0433/6353/2951/files/neurobiology_of_mental_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/14187611874.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/bokatevolirepawugajex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edd.bin
806c3f271eb570c78773e38b87a456e557892221290e9dd524f4e0502d4e2a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 5236 bytes
font_01_sfnt_off000070cb.bin
12723ffab029499b776d2f89ec1a03ce10b2f3ae588a75bbb8eea200e8a7c312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CB 9864 bytes

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