Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df83d53a5c62f0f…

MALICIOUS

PDF

54.0 KB Created: 2020-08-08 13:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce905ab75c2070ac92e5236266c02b4e SHA-1: 20bfbdec7bfa29a2ba569026fe287ea7dde4687f SHA-256: 1df83d53a5c62f0fa0584f4da6b39c3b9fd8fb2088474b5f9221f23fb2090c48
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.ru/wb?keyword=neomag%20skurcz%20ulotka%20pdf`. Another critical heuristic flagged it as a PDF SEO link farm due to the mass of external PDF links. The document body contains garbled text but includes the same suspicious URL, suggesting an attempt to lure users to malicious content.

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/wb?keyword=neomag%20skurcz%20ulotka%20pdf
    • http://files.enfieldrefugeewelcome.org/uploads/1/3/1/4/131453733/jawijamelatev.pdf
    • http://ziperat.everythingmotorcyclerider.com/uploads/1/3/1/4/131407089/zuzigo_turujixaluba_zuxemoxotil_jopezasubetivaz.pdf
    • http://lopaxitik.one-sixteenth.com/uploads/1/3/1/3/131379730/pomox-vawet.pdf
    • http://files.nducuwangugi.com/uploads/1/3/0/9/130969555/gimuviri-megatanizus-selusifo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/nitaninejenodenapuze.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2017/files/outlook_365_won_t_open.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/55403964111.pdf
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/pugixivajoluw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/ziravusilej.pdf
    • https://cdn.shopify.com/s/files/1/0427/7259/4844/files/48274030944.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/mokapodufigosilasirid.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/fleck_5600_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/fojebage.pdf
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/digital_character_development_theory_and_practice.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/37273581822.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/47771965423.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/blossoms_of_the_savannah_questions.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_off00007c0a.bin
be96271ccf7377db24f14b572972c264b793747938d7c0bd1c87c357e7b6422a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0A 5560 bytes
font_01_sfnt_off00008ef1.bin
7a63821b0bf696738786f97c521a1c39b9b784fe9983a65289b6b2e94946004c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF1 11468 bytes
font_02_sfnt_off0000b3b2.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B2 16312 bytes

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