Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e173e52f1199788…

MALICIOUS

PDF

44.4 KB Created: 2020-08-08 16:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da95ab2b1b4617a0fa646e11355f69a7 SHA-1: 8162ef24d8bb270d5cd705b9de51be86a48a810d SHA-256: 2e173e52f11997883d16a2b288574a8864ab85b9a3adfa39a9a34ca74a36e3b0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=articles+with+geographical+names+worksheets+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click on the malicious redirector URL, likely leading to further compromise.

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.com/pify?keyword=articles+with+geographical+names+worksheets+pdf
    • http://files.thelockerroom78.com/uploads/1/3/1/6/131606619/pitinumexi.pdf
    • http://files.momsclubdh.org/uploads/1/3/1/8/131856279/kegedikuke.pdf
    • http://files.cocoaandspice.com/uploads/1/3/0/8/130813447/d1b07.pdf
    • http://files.thehouseoflifevenice.com/uploads/1/3/1/3/131381555/7e9aad7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/16861619827.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/convert_string_to_integer_java.pdf
    • https://cdn.shopify.com/s/files/1/0436/1761/6034/files/titoferitijiworogutumu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2725/7749/files/gabiwojetogepeju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vujunuvitiwowus.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/upload_file_in_reactjs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3728/files/21760916311.pdf
    • https://cdn.shopify.com/s/files/1/0434/2025/4375/files/10078981900.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/burn_notice_season_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/7946/7170/files/povitinodumukipavu.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_off000060bb.bin
832b10b6e895f62725f246ceea362be5afcceca2ebb2c669cfb81d03932dd247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BB 5500 bytes
font_01_sfnt_off00007350.bin
e4b52160844d6831380e25d58121575c5b3a94e482473ce1d2343bd3579b30e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 10132 bytes
font_02_sfnt_off00009606.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9606 4324 bytes

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