Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7f26bd6efece3e…

MALICIOUS

PDF

111.7 KB Created: 2020-08-06 16:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3fc45387053aae460757212e2c851f2 SHA-1: af223144541deba7cc91871c6ffc66d6f41dd5c4 SHA-256: 7f7f26bd6efece3e3a3cf34ddff0a5c2c2a91ebab181735498dd3efb134ac3c1
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic, suggesting the primary purpose is to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=elimination+of+arbitrary+constants+by+differentiation+pdf
    • http://files.allinonerenovationsllc.com/uploads/1/3/1/3/131398423/toxof_lorozuzezitone.pdf
    • http://files.wilsonfarmmurfreesboro.com/uploads/1/3/1/4/131437924/sesujojenufivu.pdf
    • http://files.newnarrativesinphilosophy.net/uploads/1/3/1/0/131071043/zamatitegetabajib.pdf
    • http://files.ashleybaines.com/uploads/1/3/2/6/132695489/nefigafodubifudov.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9605/files/what_is_ahci.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4393/files/wodewuvexif.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/federal_mogul_engine_bearing_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/mathematics_statistics_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/95576105119.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/24665700110.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/sevodexuwiwojezit.pdf
    • https://cdn.shopify.com/s/files/1/0438/9309/6600/files/veterinary_laboratory_equipment.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/11742967901.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/pexovovawa.pdf
    • https://cdn.shopify.com/s/files/1/0436/6696/4630/files/jevafazum.pdf
    • https://cdn.shopify.com/s/files/1/0440/8888/5413/files/35706280353.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99744184538.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013636.bin
f02240d1f3b18c947802ce5d1818741491b29c0a12b57bc67b7f420e2ab14497		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13636 17004 bytes
font_00_sfnt_off00011337.bin
28ae6b78540df5813dd55ccb7bc7f4f38d3988cf36bf7e6b77d86bf9101ff95a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 6644 bytes
font_01_sfnt_off00012396.bin
e2885a5f107d839f63412ab3d99f0bd59d6b043f1127ac7f0ca2753cadf4712c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 5500 bytes
font_03_sfnt_off000169f2.bin
f8670e8125c50af5f218f8103f16d233d0fc31abdc018f0ce95d545b65e24319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169F2 14292 bytes
font_04_sfnt_off0001978f.bin
420660b5202780cc75f320585073edd3436034feb1cd8e1b48f8b2b87b72ddb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1978F 16960 bytes

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