Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c14964c956c64a…

MALICIOUS

PDF

38.7 KB Created: 2020-07-11 10:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f9da61cd7a474f6a49893821656673 SHA-1: a568f6209abc45ac6b4e6a5da05c315902526fbd SHA-256: e7c14964c956c64ae8a1e9c3bbdd40add100b45d475d698b9c7907f23ed25367
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=present+perfect+already+still+yet+exercises+pdf'. The document body, though heavily obfuscated, also contains this URL. The presence of a large number of external PDF links, many with numeric slugs, suggests a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=present+perfect+already+still+yet+exercises+pdf
    • http://files.phcstark.org/uploads/1/3/0/7/130775893/45f7b.pdf
    • http://files.hexkore.com/uploads/1/3/0/8/130873848/4143969.pdf
    • http://files.violetduanmu.com/uploads/1/3/1/3/131379663/c7c71c.pdf
    • http://files.simplymagicaljewelry.com/uploads/1/3/1/3/131398084/2ef38a3eb.pdf
    • http://files.sirreadsalot.com/uploads/1/3/2/6/132681026/vifowetojugip-gamiruxezaxe-mifem.pdf
    • http://files.theprofbodyforum.org/uploads/1/3/1/3/131378952/womotata.pdf
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdf
    • http://files.millennialenterprise.org/uploads/1/3/1/3/131398084/8f19c5c9ec91e.pdf
    • http://files.jeffallensportstalk.com/uploads/1/3/2/6/132695460/titinu.pdf
    • http://files.bradfordwatkinsmedia.com/uploads/1/3/2/3/132303242/sazumedepifelog.pdf
    • https://bijojaraduk.files.wordpress.com/2020/06/3597311779.pdf
    • https://lavuxelo.files.wordpress.com/2020/06/7103818957.pdf
    • https://lexejezuko.files.wordpress.com/2020/06/pebifeledanerej.pdf
    • https://koxezapujuf.files.wordpress.com/2020/06/15906355232.pdf
    • https://xukoloral.files.wordpress.com/2020/07/16751700947.pdf
    • https://pejeriniva.files.wordpress.com/2020/06/gaxibenovezefuwerepixujoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/67568161675.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/xekuzipodiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/danesumam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24413790208.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/67189088835.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b86.bin
d5c08234d109c60b9774ebeadcb99c4b3bb3f54147b3fd038b3164674e8a98e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B86 4996 bytes
font_01_sfnt_off00006c8a.bin
11f2128c8de1aaf15b1654ac0809208018950e57debb7f20ad076ea737477ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8A 9492 bytes

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