Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddfc19688e16898…

MALICIOUS

PDF

34.4 KB Created: 2020-08-13 00:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0567505815df1479ff26e64805b98ba SHA-1: a3f48988da17777757bf5706175e97160f40254f SHA-256: 9ddfc19688e168982b09d7c5917979bd76effcfe31168839072019bdf48aa796
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a known malicious redirector. The document body text, though heavily obfuscated, contains the same URL. This suggests the primary purpose is to lure the user into clicking malicious links, likely leading to further compromise. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=atipia+coilocitica+pdf
    • http://doredex.pentip.co.uk/uploads/1/3/2/7/132740478/mejuwuxi.pdf
    • http://files.beckyjonesart.com/uploads/1/3/1/3/131383456/vunevoba_bupulelezowasof_vixopiwigivavun.pdf
    • http://files.broncohack.net/uploads/1/3/1/3/131398242/vodaliva_zodozatonikos.pdf
    • http://files.clarelouiseburnett.com/uploads/1/3/1/4/131409498/titukoriga.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/pobipavopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/sozulijine.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/sukizusuruje.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9484/files/gabiwilazixikedazu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/22352035761.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/47232282341.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/bepadexamopa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/ibps_rrb_notification_2020_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0429/4361/1036/files/central_time_zone_abbreviation.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/neo_marxist_dependency_theory.pdf
    • https://cdn.shopify.com/s/files/1/0438/5875/5749/files/ethiopian_airlines_crash_report_2020.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_off00004bc2.bin
4e0780162f63ceaad86d39774b144b5adbcd6c5ef3e13f144a1bf947d7e1a4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC2 4864 bytes
font_01_sfnt_off00005c57.bin
e5a6ac4a9f0cf19a67ae2b51cd7265f1a0eda62ac5599782235eee233aed703d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C57 9580 bytes