Malicious PDF — malware analysis report

Static analysis result for SHA-256 351fb87f33a42635…

MALICIOUS

PDF

51.0 KB Created: 2020-08-21 03:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b229a9c5ab4811c30f5d8da128d73d SHA-1: c048ea04decc3306bcab27af9263637dd70a8023 SHA-256: 351fb87f33a42635806e86156a85e01a07f6ec1b4813e27b5636018b9a00d0de
152 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external links, many pointing to Shopify domains, and a critical heuristic firing for a malicious redirector link. The primary malicious URL, https://ttraff.cc/pify?keyword=canon+printer+software+for+mac, is designed to lure users with a plausible pretext. The document body, though heavily obfuscated, contains references to the lure and 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.cc/pify?keyword=canon+printer+software+for+mac
    • http://files.agricolacuvelier.com/uploads/1/3/1/4/131452836/46cdb03.pdf
    • http://files.westconcho.com/uploads/1/3/1/3/131379039/julafekaxojevesopibi.pdf
    • http://tuwak.mindfulness-west.com/uploads/1/3/0/7/130775607/a77ed3.pdf
    • http://waxubomek.onlinecounsellingtherapy.com/uploads/1/3/1/3/131379591/e30dfce1ae4444.pdf
    • http://files.thebankofguns.com/uploads/1/3/1/6/131637226/medefazok-musadosuziropo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/download_tutorial_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/gubiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/56681184970.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/baxajibevale.pdf
    • https://cdn.shopify.com/s/files/1/0435/5840/4245/files/tetidalemawofixogo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/list_of_african_countries_and_capitals.pdf
    • https://cdn.shopify.com/s/files/1/0458/0992/6310/files/lerozorelotogezokumob.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0600/files/bitofelegadofagolikigojox.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/66229640786.pdf
    • https://cdn.shopify.com/s/files/1/0438/9689/7704/files/fizegedereluvalisawumonul.pdf
    • https://cdn.shopify.com/s/files/1/0428/0641/1431/files/14614147903.pdf
    • https://cdn.shopify.com/s/files/1/0440/1417/4358/files/82353513301.pdf
    • https://cdn.shopify.com/s/files/1/0438/2470/9782/files/iit_kharagpur_b_tech_cse_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/compendio_catecismo_da_igreja_catlica.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_off00007b8c.bin
5ea9f9a68c70c1f0614bc94fe795ac644e4baef30254442ff459bb7d379c92d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8C 5032 bytes
font_01_sfnt_off00008ca0.bin
a5e5f1933b84107baa23fb2d9e9c54bb7abd4447c160486ae9bfd0a47f8f77f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA0 10444 bytes
font_02_sfnt_off0000b011.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 4324 bytes

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