Malicious PDF — malware analysis report

Static analysis result for SHA-256 928447c7cf2a0b62…

MALICIOUS

PDF

39.8 KB Created: 2020-08-29 17:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f24da5c4e3ec3f8675e4b1c3184cbca4 SHA-1: fb01afbeb3151b45e47166fb0b8d10759d3cfd1e SHA-256: 928447c7cf2a0b6204d7d41601069ee0c82074f73ce6549be2c3a40da0127a45
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs. This suggests the primary purpose is to lure users to malicious sites, potentially for phishing or malware delivery.

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/wix?keyword=maria+lucia+medeiros
    • https://cdn.shopify.com/s/files/1/0429/5147/5366/files/21294249208.pdf
    • https://cdn.shopify.com/s/files/1/0443/8222/4550/files/search_bar_implementation_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/6237/6101/files/mapa_metro_praha.pdf
    • https://cdn.shopify.com/s/files/1/0440/5723/1525/files/30380125568.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/fijidesogasegezolizesoto.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1b09fe3458b4864bedc3aacab44d508.pdf
    • https://static.usrfiles.com/ugd/b8c837_a47dd791f8354667970fb3e2ffea5297.pdf
    • https://static.usrfiles.com/ugd/b91566_d09aa5d684f445c6a23d0c1d1e732751.pdf
    • https://cdn.shopify.com/s/files/1/0439/4385/4235/files/2000_mitsubishi_montero_sport_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/an_autoregressive_distributed_lag_modelling_approach_to_cointegration_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0436/0824/4381/files/lowes_auburn_maine.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1005/files/protein_metabolism.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/91633880866.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://static.usrfiles.com/ugd/b91566_d09aa5d684f445c6a2

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005913.bin
97157f8978ec67100b8a5a50e8359cc706bed0243f097cfc7d69bbd8ec7fd8c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5913 5088 bytes
font_01_sfnt_off00006a46.bin
c8789a6f9874d785d741f5851f6e04fa67a0436740c7c3b25adc92b3baabe892
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A46 12540 bytes