Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ac9402279d7e0d…

MALICIOUS

PDF

37.1 KB Created: 2020-08-05 04:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c52bd00bf671c7575b18a8b8a93f6ce SHA-1: abb1a9dd00ae042383cbaa87a11d164aacdf4d3e SHA-256: 31ac9402279d7e0d977e84525c8d17db891284d91605a7b6fe8ebc62b1b06cd1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to lure users to a malicious site.

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.cc/wb?keyword=the%20latehomecomer%20free%20pdf
    • http://files.aerialrootsstudio.net/uploads/1/3/1/3/131379014/1966838.pdf
    • http://files.markcornelius.me/uploads/1/3/0/7/130738846/3262439.pdf
    • http://files.creativepathwaysprep.com/uploads/1/3/1/3/131380158/bijex_zalavojujola_puwagatiraxo_fefutifew.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/blaise_cendrars_l_or.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/gujijumofa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/wewukifeseda.pdf
    • https://cdn.shopify.com/s/files/1/0432/1155/4980/files/puvofibenonudiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/3600/8870/files/kenekosepudopajuvoponikix.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/forivadozozed.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/99901723753.pdf
    • https://cdn.shopify.com/s/files/1/0438/2192/4514/files/46893505245.pdf
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/download_pangu_9._2.pdf
    • https://cdn.shopify.com/s/files/1/0429/3876/1379/files/nifurawedowutiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/zofujezesalevululu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/87518899681.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/tagosotemogexegelogudeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/81894299546.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_off000049c2.bin
757689610fd24136618c3cd4439990f1dc5c96efff1d81b3573108c0d613915b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49C2 4800 bytes
font_01_sfnt_off00005a13.bin
124ed155b39d7d7ff4def826bd60315fedc26d1ca8e1a2c684662242bb297a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A13 9228 bytes
font_02_sfnt_off000079ac.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AC 4324 bytes

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