Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3118c7c1bc6cebe…

MALICIOUS

PDF

53.4 KB Created: 2020-08-19 15:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f60c5477642a1b4e912958a0e25e01b2 SHA-1: f4ec2522578a29586bee0b2b42147c91c15e7ebb SHA-256: a3118c7c1bc6cebe3eb3c6b77629349f6d33194404acfb88e89231ca0e7be113
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDFs, likely for SEO manipulation or to distribute malware. The presence of a malicious redirector URL suggests an attempt to lure users to a compromised or malicious site.

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=wetter+cavallino+treporti+juni+2019
    • http://zikuze.firstloveradio.org/uploads/1/3/1/6/131607240/wixefufumosobit.pdf
    • http://files.warwickkentphotos.com/uploads/1/3/0/8/130874683/kuwakukimiz.pdf
    • http://files.jamesaodell.com/uploads/1/3/0/7/130738806/piburugapawuju-xuxobivexavefok-savuwogoboz-kilami.pdf
    • http://keradil.magnoliaandwillow.com/uploads/1/3/1/8/131871796/ferogetagik_jexafapivelule_tuzuxido_gibal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/sovimelixofuje.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/zobovutifulotatexopaxizaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/high_digestive_tract_bleeding.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/quran_surah_ar_rahman.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/xuwexot.pdf
    • https://cdn.shopify.com/s/files/1/0427/8625/9100/files/92352292253.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2102/files/59572515680.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/borutazaweluv.pdf
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/htaccess_for_kohana.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/pan_card_application_for_nri.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/91347652933.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/wheel_of_life_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0439/0469/6472/files/applied_calculus_4th_edition_hughes_hallett.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_off00008eda.bin
3c1360afeb172d4d4b4b0345478fc4a1a608618d6860375ebf07f87e8c074449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDA 5380 bytes
font_01_sfnt_off0000a151.bin
963fb7a6358a91a505cd514f96d8662f87da034db872c8fba3352833b6de41dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA151 11532 bytes

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