Malicious PDF — malware analysis report

Static analysis result for SHA-256 836b4c327b08bf2d…

MALICIOUS

PDF

66.0 KB Created: 2020-08-03 13:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f0c7894fdc21533ef527b1d7ac3d09 SHA-1: 3df0fe6d99a2fb156d1174735759b756797be768 SHA-256: 836b4c327b08bf2dbe00b33fbf42c1c951a20097ad97253d37efdae3c027f085
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure for free downloads, including the malicious URL. This indicates a phishing or social engineering attack aiming to redirect users to malicious sites.

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=bimar+abid+pdf+free+download
    • http://files.localgreenssb.com/uploads/1/3/1/4/131483110/4bcf4a8c7cdc.pdf
    • http://files.compassionchristian.men/uploads/1/3/1/4/131437363/8c19ba0989b48.pdf
    • http://files.christopherpalmer.co.uk/uploads/1/3/2/3/132303077/9707717.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/concrete_repair_materials.pdf
    • https://cdn.shopify.com/s/files/1/0431/3091/2934/files/77862396483.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8342/files/disable_gear_vr_service.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/winitadorubefesilamapudon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35031547028.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0436/1158/6722/files/vesimiwufimiximeduv.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6477/files/atomic_absorption_spectroscopy_principle_and_instrumentation.pdf
    • https://cdn.shopify.com/s/files/1/0431/8861/7378/files/luzuremuwibusozimogutorek.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/74327640271.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2332/files/83492306079.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/21280903179.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/xuzoratagixo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/85696409544.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000c4cf.bin
c56e004342506b3c996c368b81bbb7bc911320d7f5b2c995f1a9553488a7bdf1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC4CF 22984 bytes
font_00_sfnt_off00008cfd.bin
8d8e7752d0dc1d793d1a8e928d958953f108875913a6421395d0acbeef9ba0b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFD 5000 bytes
font_01_sfnt_off00009ddf.bin
d409f357fd87e41f96ce75f00fd0397b097b14188c463e4cb71168b66f29ded1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDF 12048 bytes
font_03_sfnt_off0000ec7e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 4324 bytes

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