Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9730e9d7aac2a2…

MALICIOUS

PDF

43.4 KB Created: 2020-08-10 22:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbfe376fad6f47a6322a308319e8f2d2 SHA-1: d966597b65262055b1c730a75beb351a05b6d9e8 SHA-256: aa9730e9d7aac2a2dd96b15051bb322d52003cfa67c402469941b8d6e60d8d96
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains numerous embedded links, indicating a malicious redirector strategy. The primary malicious URL identified is https://ttraff.ru/pify?keyword=tipos+de+bacterias+nitrificantes+pdf, which is likely used to funnel victims to further malicious content. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malware through various compromised or controlled 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=tipos+de+bacterias+nitrificantes+pdf
    • http://files.vujadeaudio.com/uploads/1/3/2/6/132682686/5137128.pdf
    • http://files.lightindarknessohr.org/uploads/1/3/0/7/130776031/bbf2df8.pdf
    • http://files.jrselectricinc.com/uploads/1/3/1/3/131384286/roribila.pdf
    • http://files.italianamericanclubofduluth.com/uploads/1/3/0/7/130738806/rirabiwok_mejozatamuju_mufasegadenado.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/rewovegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6863/files/98226405883.pdf
    • https://cdn.shopify.com/s/files/1/0438/8395/4328/files/sivawogan.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/fefuroxojigonenopij.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/saltwater_fishing_knots.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/xapejivitumomulapekawus.pdf
    • https://cdn.shopify.com/s/files/1/0432/8010/5630/files/1._able2extract_converter_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0438/2153/1293/files/32534707018.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/86_nissan_pickup.pdf
    • https://cdn.shopify.com/s/files/1/0428/7011/2423/files/nunesiwos.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/
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ed.bin
164c4f84f013549b168e9108eea191e41d244de6af357562031891c6743b9e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x69ED 5208 bytes
font_01_sfnt_off00007ba4.bin
47e01fa0b1995245715f65a712e3d628b1b88360ef64aa2582379fa0cf56ee5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA4 10764 bytes