Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13ce57ea21cdc2c…

MALICIOUS

PDF

66.1 KB Created: 2020-08-09 17:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1df30103698dd7206baf404d1c3da8bf SHA-1: 7cacb75edf4572f34f05fae221c3e4b386950ba3 SHA-256: e13ce57ea21cdc2cbe7b3924e5ce0033d17065dda197c36e470b636e6d7d9dff
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=english+phrases+for+daily+use+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and a reference to the redirector URL, reinforcing the malicious intent.

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=english+phrases+for+daily+use+pdf
    • http://files.mmeramirez.com/uploads/1/3/0/9/130969655/matodikajusuze-dabidox-kosaluzikeso-vanejamedopezug.pdf
    • http://files.santafesoapfactory.com/uploads/1/3/0/8/130814208/3532235.pdf
    • http://files.donciedoodlesohio.com/uploads/1/3/1/6/131607163/vufexejepiwobo-rumilupos.pdf
    • http://files.morlandteachesart.com/uploads/1/3/0/8/130814423/a794fdc.pdf
    • http://files.serviceccrunning.com/uploads/1/3/0/8/130873941/e987e9d8543f.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/mpsc_electrical_engineering_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30611133668.pdf
    • https://cdn.shopify.com/s/files/1/0433/7834/4085/files/rifijolatoxofifimirob.pdf
    • https://cdn.shopify.com/s/files/1/0432/4425/7442/files/fapawonekobemijidegoji.pdf
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/39345287516.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bojakotipizijogi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/wifukefog.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/82090198065.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/80973163856.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/18321589802.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095f0.bin
51ab6905290750564d90708e7631dedb146f5386d6918388d3b3373a2b20f6d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F0 6476 bytes
font_01_sfnt_off0000a5f6.bin
5f006a39d2f4dce74dbb58b0a5df8b735fe704bbbb1ac86246262f5e92af2935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F6 5364 bytes
font_02_sfnt_off0000b834.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB834 1800 bytes
font_03_sfnt_off0000c0c2.bin
4989dced4d9de9a5cdd8fdb81966267ac0eda068672ab623e594600e41bd8fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 10296 bytes
font_04_sfnt_off0000e422.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 16312 bytes

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