Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bea21b2147f872…

MALICIOUS

PDF

80.4 KB Created: 2020-08-03 12:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6006b23e65976c03ca79c5b08fa66e5 SHA-1: 9a96588736ee44314450b953d4c73ba041296f1b SHA-256: d8bea21b2147f872df8f2a421664f0cdf85371db5f7b7616c7e3c928bf06fd67
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with many pointing to a redirector service. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links leads to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests a large number of external links are present, likely for SEO manipulation or to distribute malicious payloads. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=green+revolution+pdf
    • http://files.arnoldroad.org/uploads/1/3/1/4/131406060/8505364.pdf
    • http://files.oceanstatefollies.net/uploads/1/3/0/7/130738714/6959e5.pdf
    • http://files.ikargb.co.uk/uploads/1/3/1/4/131409170/c416f2d8c877.pdf
    • http://files.upwardfacinglife.com/uploads/1/3/1/4/131436971/velolerulamur_baxafijirun.pdf
    • http://files.drakeuniverse.com/uploads/1/3/2/6/132695714/1863023.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/82392254193.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/839550052.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/jojezim.pdf
    • https://cdn.shopify.com/s/files/1/0430/9955/3959/files/naveda.pdf
    • https://cdn.shopify.com/s/files/1/0441/3059/9064/files/stronghold_hd_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/rocket_league_png.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3888/files/27372216743.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/bacterial_biochemical_tests.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/44199607077.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8139/files/pugedefigeributovorawaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/diablo_3_best_barbarian_build.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb4.bin
c0f074f2740c4127e707122baa1320e74a83e7bba096e06a2a0a6ad33ceaca3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 4740 bytes
font_01_sfnt_off00010fee.bin
71546cd2f81af1fa04b9ce5007baeecc7b52ed04a49ad22670aea421b07ec5b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 10856 bytes