Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b3279c16df99e1…

MALICIOUS

PDF

48.0 KB Created: 2020-08-13 17:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 094b8f72ab707b0a14f412ae9c24f482 SHA-1: 90b1da2d6ec291adb69871c77b9a58706cce05f1 SHA-256: 40b3279c16df99e1f5e6e94cc04cec4f42563cd60371255341d3f0e0ef4d7e78
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. No scripts were extracted from this sample.

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/wb?keyword=proverbe%20d
    • http://files.danajaybein.com/uploads/1/3/2/8/132815767/pedozajugima.pdf
    • http://sedurix.a2acollaborative.org/uploads/1/3/0/9/130968996/6059600.pdf
    • http://files.realmilklexington.com/uploads/1/3/0/8/130814605/6c02eb554cf.pdf
    • http://files.jsaadsales.com/uploads/1/3/2/8/132815008/971d0f9cd.pdf
    • http://files.tamaraturnbeaugh.com/uploads/1/3/1/4/131452903/9530362.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/biviluxon.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/94072622326.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/cmas_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/6939/0500/files/faxuteturakogis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/what_s_the_best_ebook_reader_that_supports_and_epub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9479/files/osrs_abyssal_demon_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/5833/7694/files/magic_photo_edito.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0729/files/100_green_smoothie_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/nuxomudisolukutedetizana.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/32540414913.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/rooter_nexus_7_2013.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/teputol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/pufurevivubanojofezofeb.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b53.bin
e61546eb21ed2101b8281f1105f60c4e123761415eee4b7ae7359e24851d26b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B53 5168 bytes
font_01_sfnt_off00007cf3.bin
eeadad3424a531f8553b27aacbd11d0387b310c603604de2c631b1bff9f6fa07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF3 12208 bytes
font_02_sfnt_off0000a326.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA326 4324 bytes

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