Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b14fb68bc1c58b5…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 07:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 256b48fa49be289859d15c549f3c3e5c SHA-1: 1794b65131f592bb46673858e895241c2aaef877 SHA-256: 4b14fb68bc1c58b555376b48a0c3be9e03914ef141073c15f13c430792075275
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to further malicious content. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to 'lrit reporting requirements'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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=lrit+reporting+requirements
    • http://files.climateviews.com/uploads/1/3/0/7/130775432/bijuf.pdf
    • http://fotovaxe.mikewimmerportraits.com/uploads/1/3/0/9/130969754/baxireteweko_lupekusa_gakewelasik.pdf
    • http://files.countryrichfashion.com/uploads/1/3/1/4/131406068/facb73cad.pdf
    • http://files.fourmonkeysboutique.com/uploads/1/3/2/6/132681728/kimopofukibif.pdf
    • http://files.stillnessinmovement.com/uploads/1/3/0/8/130874544/3253916.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/mabuwejowasakelubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0700/files/algebra_2_textbook_mcdougal_littell.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/32678924140.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/kopalaxorop.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/20913440099.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/51040866982.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0177/files/97422968611.pdf
    • https://cdn.shopify.com/s/files/1/0429/1208/8231/files/arabic_english_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/22328017203.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/jafepikevobigef.pdf
    • https://cdn.shopify.com/s/files/1/0435/7138/0383/files/vogojilafutefizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4312/6438/files/el_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/zajiviwagomuvafeni.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f8d.bin
35f16c9facf3194e41d86c1f2157b0f62f228e770efa872e16adf19220fc4238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8D 4964 bytes
font_01_sfnt_off0000805e.bin
4e434b4098d29772455ef7d95b4ed87403e8917a69767aea7a5919d729a73dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805E 9608 bytes

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