Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dd678b4a0dae58…

MALICIOUS

PDF

35.2 KB Created: 2020-08-21 07:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80054e89a0ea3d574dc53938843ba394 SHA-1: 7cab89c049485bb3e4643c30d4181f6dbb31008b SHA-256: 18dd678b4a0dae58a2bcc35a5b2cecda03c0f0636f02a9eb593087d9b8772aa4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

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.ru/pify?keyword=kambikuttan+net+pdf
    • http://files.bowerslab.org/uploads/1/3/1/3/131398102/9d47e.pdf
    • http://files.sophieknab.com/uploads/1/3/0/7/130739544/gedegigubaziku-bofoxo-pabevu.pdf
    • http://files.crackedbreakfasttruck.com/uploads/1/3/1/1/131164198/7020449.pdf
    • http://files.greeneryarts.net/uploads/1/3/0/7/130739747/pasapikaruroj-gijofitidova-bujodegubowegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/77978925480.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0902/files/basic_plc_programming_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/palabras_basicas_en_ingles_y_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/nuketown_bo3_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/7361/8599/files/23826408040.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/raxadopadikozopoxetopa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/jataxakanovevikona.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/gleichungen_lsen_klasse_7_aufgaben.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7462/files/819863724.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ab7.bin
2ce975693535516df5b79a7dad4c3decc9a0c33ac71f00b895e3787ac49ddce5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AB7 5052 bytes
font_01_sfnt_off00005bd9.bin
097c4117f36e998a73f833bf523de7512d54c89636e9f512b26a7ec82c430d63
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD9 10704 bytes