Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d49455aab5d5f7…

MALICIOUS

PDF

42.7 KB Created: 2020-07-17 19:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5410dd8de740b4890b56e183b514904 SHA-1: 781166f34d43e63d59d0e637356ec7e53a067797 SHA-256: b5d49455aab5d5f73bbc972922709242ae87cd1738c21983afe60f6a1364a79b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to generate traffic or distribute malicious content through a large number of generated PDFs. 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/wb?keyword=vw%20polo%202017%20user%20manual
    • http://files.chitantraflow.com/uploads/1/3/0/8/130815437/kiwavokev_kaxuxu_xalamebilapale.pdf
    • http://files.conleyxc.org/uploads/1/3/0/8/130873826/xolomajikesu_sekizodusaxozog.pdf
    • http://files.heartpieces.net/uploads/1/3/1/3/131379749/3776242.pdf
    • http://files.davesartdimensions.com/uploads/1/3/1/6/131606348/vojetiborakupo.pdf
    • http://files.neilmckenzieyouthfishingcontest.org/uploads/1/3/1/6/131606127/1963708.pdf
    • http://files.buffalocommonspress.com/uploads/1/3/1/4/131407214/9728085.pdf
    • http://files.rivercrestpto.com/uploads/1/3/0/7/130739996/lizonopemedum_gemalafadifa_lejagawoloraz.pdf
    • http://files.suffolkliago.org/uploads/1/3/0/7/130739809/3191777.pdf
    • http://files.musicattheoldchapels.com/uploads/1/3/1/6/131636689/tuwumovagup-mozikeruri.pdf
    • https://nojalefise.files.wordpress.com/2020/07/28744517409.pdf
    • https://pubizebut.files.wordpress.com/2020/06/kararusiveletosuse.pdf
    • https://zavoduf.files.wordpress.com/2020/07/56912329396.pdf
    • https://puxeter.files.wordpress.com/2020/06/98748502945.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6554/files/zejafeviripasijukudip.pdf
    • https://cdn.shopify.com/s/files/1/0431/2658/7549/files/sezakiluji.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/dosebobi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/43901885003.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/86969805957.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8167/files/bonorin.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/41319969872.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/18580578905.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_off0000675b.bin
d9c3c50cef2c0dbf31c8954dacf43474d487162bb54b41d97ce0016ffe6a311c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 5184 bytes
font_01_sfnt_off000078f1.bin
4e0ec418510b7caf37c6e6af8ee2fae3a318d88ef21c42bf7dbcc8ffcc638967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F1 10572 bytes

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