Malicious PDF — malware analysis report

Static analysis result for SHA-256 932df1c0f0ac1739…

MALICIOUS

PDF

46.5 KB Created: 2020-08-10 22:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d422d4e83cfbf0555fbbc7f40dcfd616 SHA-1: f322b89208c1e063d793536f52a0e56b4c9a9b8a SHA-256: 932df1c0f0ac1739a03baf29faa9e13e8b4afabd998bb4cf99d22dd2564545d8
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 a critical heuristic firing indicating it's a link farm. One of these links, 'https://ttraff.com/pify?keyword=barashada+english+somali+pdf', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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=barashada+english+somali+pdf
    • http://files.ingecasteleyn.be/uploads/1/3/1/3/131384424/f9c48f1dbfd.pdf
    • http://files.redmondacademy.org/uploads/1/3/0/7/130738622/bdaa3af8e1fa1a2.pdf
    • http://files.universalwellnessaz.com/uploads/1/3/0/7/130738704/biguxiriboguma-wixuk-sukabote.pdf
    • http://vebutu.robinsongolfart.com/uploads/1/3/1/3/131398367/ruwemiwipowo_laxoxiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9327/0429/files/gifomubilisalunodewoxidil.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/nobuzesunolez.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/famozut.pdf
    • https://cdn.shopify.com/s/files/1/0437/2856/8474/files/65366150901.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/74123269002.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/witelogurufubefem.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/xagivatagexo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doworefobose.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/menim.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/31716744888.pdf
    • https://cdn.shopify.com/s/files/1/0440/5130/0517/files/apoptosis_y_muerte_celular.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fd6.bin
40935642d6b1d03bc5edd5c1cc4eb90033a9687e34d9251328868f3e7bac612e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 5212 bytes
font_01_sfnt_off00007152.bin
90ba86e8a8e01546a006c12fe3eb2b241e508c5c7d488afac1c36cf03e9e0f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7152 14776 bytes
font_02_sfnt_off00009eab.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAB 4324 bytes

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