Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88aa36ec21a3919…

MALICIOUS

PDF

34.6 KB Created: 2020-08-28 09:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5dd39807c413a34e6ad25e1aa8b426f SHA-1: 5ab9f12cbf05151d73482075578d5010f89360aa SHA-256: c88aa36ec21a39199d4b1217e8f96d8a89025999425984074389042dc4591584
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, specifically pointing to 'https://ttraff.com/pify?keyword=read+sherlock+holmes+online'. Additionally, it exhibits characteristics of a PDF link farm, embedding a large number of external links, many of which point to shopify.com domains. The document body, though heavily obfuscated, contains the same redirector URL and a title suggesting a lure for reading content online. The primary intent appears to be directing users to malicious infrastructure.

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=read+sherlock+holmes+online
    • http://pipud.stonehilltheatricalfoundation.org/uploads/1/3/2/3/132303079/tijit.pdf
    • http://files.thebakingpixie.com/uploads/1/3/1/3/131380915/5798451.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/46432844114.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/44889255183.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/funegefatirudesarokozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/boulevard_of_broken_dreams_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/ketapexezumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7958/2374/files/15821132438.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/89688244066.pdf
    • https://cdn.shopify.com/s/files/1/0435/7134/7619/files/baba_balak_nath_chalisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/43629713832.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/benzimidazoles_synthesis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6646/files/pdf_converter_to_word_document_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8865/9100/files/managerial_accounting_for_managers_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/sajusuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/jamubatun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b1f.bin
ac23260271f6af8520bb05a9e0ccb93a2738a59654b91bfa3948f5e3d0922cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1F 5248 bytes
font_01_sfnt_off00005ccc.bin
c0bae0d79d8c825b5b4a87407d3b423cdf92a3e128fa4a55ce1fb4d3c63316fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCC 9456 bytes

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