Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e804bcc01a7215…

MALICIOUS

PDF

37.6 KB Created: 2020-08-13 05:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e831e02ea78b0531310f623c63f6b1f1 SHA-1: 049808c374d907fecbf80419750094c0d9d7a951 SHA-256: 50e804bcc01a7215dff7f51f65ecdd93d4cd542609d3e2af8387a6f70e75798b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though partially corrupted, includes text suggesting a lure for 'construction accounting and financial management pdf download' and the malicious URL. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or SEO poisoning attack.

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=construction+accounting+and+financial+management+pdf+download
    • http://files.ithacaymca.com/uploads/1/3/0/8/130874691/satetazaradadus.pdf
    • http://files.sunbirdtravels.com/uploads/1/3/0/7/130739570/luvagama.pdf
    • http://files.jonathandearmusic.com/uploads/1/3/2/3/132303359/9ec48265ab860.pdf
    • http://files.cierrasedgeamstaffs.com/uploads/1/3/2/3/132303151/3d9adddcee.pdf
    • http://files.distribucionesfrilav.com/uploads/1/3/0/9/130969358/waruxikajefepuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/0818/8839/files/vubusuz.pdf
    • https://cdn.shopify.com/s/files/1/0454/6029/1742/files/accounts_receivable_management_policy_theory_and_evidence.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2557/files/57277323244.pdf
    • https://cdn.shopify.com/s/files/1/0437/5442/2423/files/27814512704.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/33470589388.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/adjectival_phrases_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/tipigofowazagugekajuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0431/3494/3388/files/40966086868.pdf
    • https://cdn.shopify.com/s/files/1/0438/3935/7093/files/chloroacetyl_chloride_msds.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_off0000543c.bin
f06c8ec98b077fafa56732f64f32519f24f8d1e2426c1bf9059c21ad3b8584c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x543C 5472 bytes
font_01_sfnt_off000066cf.bin
d98343fdd960fee9b68e101c110a8a47d3be9b90b5ff3b8bf01b2cc4a35de8e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 10020 bytes