Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5785a0ebfa116e…

MALICIOUS

PDF

55.6 KB Created: 2020-08-02 05:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d195a3ce24e522057f1fa722649592 SHA-1: a2f589041d3dec523fea714c3a76d59ea7772713 SHA-256: 1d5785a0ebfa116ec04268ecf1cd13ee19ccd0b598275fc039809f6f6ae59906
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.ru/pify?keyword=japanese+cartoons+movies, which is a known malicious redirector, and numerous other links pointing to Shopify domains, likely part of a link farm to obscure the true malicious intent. No scripts were extracted, but the extensive use of redirectors suggests an attempt to lead the user to a 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=japanese+cartoons+movies
    • http://files.mypatternbreaker.com/uploads/1/3/1/4/131483266/misuwedixafug-sejamemuva-govilivinozeme-jifabojonekaxi.pdf
    • http://files.pfcmooremess.com/uploads/1/3/0/7/130776072/65264bc54.pdf
    • http://files.casadegrode.com/uploads/1/3/0/7/130740490/1599073.pdf
    • http://files.beneaththebark.us/uploads/1/3/1/4/131408572/kevikojiwujavixojevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6019/9573/files/genius_training_student_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/52055846769.pdf
    • https://cdn.shopify.com/s/files/1/0436/4258/5241/files/vabuwukilufuregufefuse.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/pider.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/destro_warlock_stat_priority.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/furugavazejetotimumeluz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5363/8044/files/28403311579.pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/20141296520.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/this_kiss_faith_hill_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/nvidia_auto_detect.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/32467757831.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/mezazudunepedev.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/html_form_autocomplete.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/ramefakawidomobopepede.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009148.bin
61298ab60e1d5487ddbf44c497e7c0a2836739243d19a82dda04fb7d565c83b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9148 3088 bytes
font_01_sfnt_off00009c4c.bin
d572abac5e8691e184761215955b1e1e9fe3c7276ef1175092ce0321628fec56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C4C 5096 bytes
font_02_sfnt_off0000ad90.bin
e5ca37cf02aeddb732250aa68b094b68ef130e45a2aa22566d9cf9657dd9c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD90 10240 bytes

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