Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b7f25041aef90c…

MALICIOUS

PDF

46.5 KB Created: 2020-08-24 10:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bc06f2d1b005a1af17f53b33cc8cd60 SHA-1: e6e532f28e72406dbe3fbf086bbba531b79f5b3b SHA-256: f3b7f25041aef90c34936740bdb3fdedc2c99fb85539e1eda0ab4e8298ab1db1
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious link, 'https://ttraff.ru/pify?keyword=analog+audio+format+definition', suggests a redirection to potentially harmful content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload execution.

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=analog+audio+format+definition
    • http://loxebe.teensfirst.org/uploads/1/3/1/4/131482916/vadoxatiniga_pixupumigikuxi_gatogud.pdf
    • http://files.fewdstar.com/uploads/1/3/0/7/130776350/4578452.pdf
    • http://files.calgarymemorial.com/uploads/1/3/0/8/130874305/fd7bcc08e.pdf
    • http://files.levelupchurchmemphis.com/uploads/1/3/0/8/130874671/nikobutizineka.pdf
    • http://miboweb.organicbakies.com/uploads/1/3/0/8/130874431/93c980.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/words_words_words_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14490041284.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/google_apps_script_tutorial_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/4383/9385/files/lamuwegagumaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/dumisawademubanativi.pdf
    • https://cdn.shopify.com/s/files/1/0454/2480/3996/files/voxukutakumowikulugojogi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/niresh_yosemite_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/departmental_test_answer_key_january_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/9339/2536/files/334064276.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/lovunuxanenopivotixakune.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1546/files/pdf_editor_to_word_converter_free_online.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_off00006ba7.bin
a8267cce97018cc6c56469132ebcaa362efb61d0d2df61fad1c595ae2bd4c719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA7 4920 bytes
font_01_sfnt_off00007c43.bin
ef4360ee55024b63bebe7d8ed54a54037194832314b61b9226bd3017a4902f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C43 10144 bytes
font_02_sfnt_off00009ef5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF5 4324 bytes

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