Malicious PDF — malware analysis report

Static analysis result for SHA-256 118e69833efa29ec…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 23:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14403fdf74ee8df99b0a609f681d8fbd SHA-1: 4cf60c6d8d30904434b13080becba2e8a7ff2bb6 SHA-256: 118e69833efa29ec741f95ace33891adc1cee0253e3a5f4e0d453936f8eddac4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many pointing to PDF files on Shopify, suggesting a link farm. One critical heuristic identified a link to a known malicious redirector, indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link are strong indicators of 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/wix?keyword=molecular+cloning+a+laboratory+manual+%2528fourth+edition%2529+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/vepupesawoxanu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9310/files/68904182682.pdf
    • https://cdn.shopify.com/s/files/1/0431/4978/7285/files/carrier_30xa_chiller_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/adventure_cove_water_park_guide_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/dunizubafajuduzojag.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/doubly_linked_list_python.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6071/files/english_language_placement_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/bsc_1st_year_differential_calculus_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/7799/9528/files/reguretuwulidavigojebif.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/84570801205.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/60320516974.pdf
    • https://cdn.shopify.com/s/files/1/0437/4446/0951/files/70619328573.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0ebfcabce4c4cf0a162a5a8fcf1f344.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_42ca1e8192d149a49c4856ab7bd7d678.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf4ec05f5bf402faf6d38e30f2777ea.pdf
    • https://static.usrfiles.com/ugd/73f3b0_7d08a936260a4eb0a52a0e56bb6d5d7d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058a2.bin
0f3f219321ee903941e298f3121cf50d21ba2abbda6deda54f6881ea8c09f2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A2 5752 bytes
font_01_sfnt_off00006c38.bin
ce781750eb25779247eed4d92f6c88a112073957d9808228a7f96bd52d9a9830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C38 11428 bytes

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