Malicious PDF — malware analysis report

Static analysis result for SHA-256 4432dcc258e5f599…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 21:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1fbd69471b1868a1ecae1b6f8fa9f09 SHA-1: 3ba13db94b44fe5e2eed1e9b8012f276f0b04f19 SHA-256: 4432dcc258e5f5991d0b90919e4fbd0cdfd4833a9ccb904591acfbf3f424e453
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.com/wix?keyword=polaroid+ie826+manual, which is likely used for redirection. The document body contains garbled text but also includes the same URL, reinforcing its presence. The presence of numerous links to external PDFs, many hosted on Shopify, suggests an attempt to create a link farm for SEO manipulation or to host further 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.com/wix?keyword=polaroid+ie826+manual
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/blacklist_app_for_nokia.pdf
    • https://cdn.shopify.com/s/files/1/0437/9928/1821/files/18302046357.pdf
    • https://cdn.shopify.com/s/files/1/0431/3514/0007/files/gmat_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/a_level_computer_science_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/xemegidemolujizudevepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/89912652329.pdf
    • https://cdn.shopify.com/s/files/1/0437/8407/7473/files/glossary_of_soil_science_terms.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/xuloterovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9958/5696/files/importance_of_science_in_early_childhood_education.pdf
    • https://cdn.shopify.com/s/files/1/0434/6858/7174/files/19503888427.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5957/files/40814980395.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1549/files/me_too_meghan_trainor_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1211/8952/files/minecraft_education_edition_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/5902/5822/files/safulazivirepoli.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/baixar_editor_serial.pdf
    • https://cdn.shopify.com/s/files/1/0438/2582/3904/files/solving_systems_of_linear_inequalities_guided_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/vusawif.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_off00005650.bin
045f4e8d0aec9c3a4bc0a5f36d64754322f8a1500c89b1f0bd6f2aaeb5db0e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5650 5076 bytes
font_01_sfnt_off0000675f.bin
482b33fe653b6050d39a9443ea39093145fc0a4e83a46acb222bc6466dc0023c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675F 10688 bytes
font_02_sfnt_off00008b30.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B30 4324 bytes

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