Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e56d9f95074d24…

MALICIOUS

PDF

43.1 KB Created: 2020-08-07 09:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c9e981b347ff0f431a22cb1513cce9 SHA-1: b88f02aeae9abd56808951f3aa52368d2f4028aa SHA-256: a5e56d9f95074d24ae46195fb094f7b5586b33da902c8946f29a6277f9d69d24
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary malicious link being 'https://ttraff.com/pify?keyword=tipos+de+valores+morales+pdf'. The document body, though partially corrupted, contains this URL and other embedded links, suggesting a lure or SEO manipulation tactic. No scripts were extracted, but the high number of external links points to a delivery mechanism for further malicious content or traffic redirection.

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=tipos+de+valores+morales+pdf
    • http://files.easternsloperanch.com/uploads/1/3/2/6/132681404/3588728.pdf
    • http://files.jpheffernan.com/uploads/1/3/2/6/132681916/c9ccf39e.pdf
    • http://files.mocommunitytrees.org/uploads/1/3/1/6/131607010/wojodikoji.pdf
    • http://files.iamprovisionministries.com/uploads/1/3/0/9/130969298/9266805.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/22872371323.pdf
    • https://cdn.shopify.com/s/files/1/0428/3554/2182/files/zegasosuzawepet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/13231884381.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5526/files/76520751982.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1974/files/3376859696.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8541/files/nursing_code_of_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9898/files/love_will_tear_us_apart_bass_tab.pdf
    • https://cdn.shopify.com/s/files/1/0432/5192/5155/files/45945182220.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/74358146036.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/26664645568.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekutaxawiwasutoxojopelor.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/dabalelujijenutiduluwol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/18769143504.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/vedarosagerefexafib.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_off00006919.bin
60340aaceb087364fe738bb1862ba17cf033641c206ac705a46843cf5ea52f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6919 5196 bytes
font_01_sfnt_off00007ab5.bin
796728b223d0bea5648b94193c09c9febeec8714b022d3e82be1c9a42fba4730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB5 10788 bytes

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