Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d94d6b77b7e237…

MALICIOUS

PDF

60.6 KB Created: 2020-10-27 09:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: add1b0f1cc4d697e45eda10a3e4ce915 SHA-1: 2df41a1c05330082c980585aae480b2e95dd31a2 SHA-256: 31d94d6b77b7e23758d902ea414bc4f01572c44bb5e700e0d7d8b7a05939c2f1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, indicative of an SEO link farm. The embedded URL `https://ttraff.ru/123?keyword=the+hitchhiker%2527s+guide+to+the+galaxy+book+analysis` is identified as a malicious redirector. The document body contains obfuscated content and references to the authoring application, but the primary malicious activity appears to be the extensive linking.

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/123?keyword=the+hitchhiker%2527s+guide+to+the+galaxy+book+analysis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f8de9a133b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f88250420ade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f94823e3928b.pdfIn PDF document text
    • https://gagumosesixibo.weebly.com/uploads/1/3/4/0/134018544/mujememubasekojipe.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/9be944c92ce7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1809/9094/files/poleponuxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4359/3633/files/98839420715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6297/4395/files/sirah_nabawiyah_bahasa_indonesia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0882/7807/files/tre_metri_sopra_il_cielo_streaming_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/tufemeridetapuwamoxube.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/28591468164.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/vakadenanusoge.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/mario_benedetti_poesa_con_los_jvenes.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/brown_eyed_girl_lyrics_and_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717d7f14-0f54-4f78-b058-37e62092a1e0/fenapijuzelanubifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17bc06ba-6e46-4bf6-8c29-67bce3c9f8cd/35619326442.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ac3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAC3A 23976 bytes
SHA-256: 9de011ffcd3fc7832147efb33fc030728f858f9f10d7b0781159d56252fc3bc9
font_00_sfnt_off000073bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73BF 5440 bytes
SHA-256: c41fd6db09e2b98382ad3aed1773fae88e49ae325d726dd4e1f4fa5212d646c7
font_01_sfnt_off00008646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8646 11076 bytes
SHA-256: 4601ee3d6a3c8439f47c4377318f48dc2f1625336415974630c06b84ea800257
font_03_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

Open this report in the interactive analyzer, or submit your own file for analysis.