Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aee57b8d596707c…

MALICIOUS

PDF

59.3 KB Created: 2020-09-03 00:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d885bae96756be1b1c8e0f7abe951ee3 SHA-1: 1869d09891a8af30340a895019386f3c773c08f7 SHA-256: 2aee57b8d596707c003165fe22087966b666fd87447140d9f4c656500be3d874
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=copper+coated+sheet', is designed to redirect users to malicious content. The document also contains a large number of embedded links to Shopify, likely part of a link farm to improve SEO for malicious content, with one example being 'https://cdn.shopify.com/s/files/1/0434/5082/6905/files/fractions_and_percentages_worksheets_year_5.pdf'. No scripts were extracted from this sample.

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.cc/pify?keyword=copper+coated+sheet
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/fractions_and_percentages_worksheets_year_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/mogobojijagi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/wovafikukagimisar.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/ccnp_tshoot_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9665/2443/files/bow_tie_methodology.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/unlock_bootloader_huawei.pdf
    • https://cdn.shopify.com/s/files/1/0435/9539/9325/files/zasafuputasuderokarut.pdf
    • https://cdn.shopify.com/s/files/1/0437/4708/2389/files/susuki.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6264/files/55033693263.pdf
    • https://cdn.shopify.com/s/files/1/0434/8372/5990/files/halt_and_catch_fire_imdb.pdf
    • https://cdn.shopify.com/s/files/1/0448/0168/7714/files/building_materials_lecture_notes.pdf
    • https://static.usrfiles.com/ugd/9b5f63_78015510f0e2458e99cd1a2ee12bb074.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_f4c01fa1589d4becb55f2af88bcf696f.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_off00008a8e.bin
2bcbd2f1d95c8fa51c14e3a161359a06bb3924360f3a648fa0006d6f67d387e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8E 5036 bytes
font_01_sfnt_off00009ba0.bin
ee325108671bf45efed2f8de8846658f91efc9659ca6277346953a608bd91ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA0 15256 bytes
font_02_sfnt_off0000cb69.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB69 16164 bytes

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