Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c91c22136df811…

MALICIOUS

PDF

51.0 KB Created: 2020-08-21 11:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccd72e77a71ccfdcf6fdd9ed765ae371 SHA-1: 978d797bd6d7f7a68f2e0ed11e7e965788fec819 SHA-256: a1c91c22136df8112f74e424aa03fc47554128b885ae4ad832997a1a78dfb0c1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a movie download, including the malicious URL. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or malware distribution.

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=abominable+full+hd+movie
    • http://files.rrmusicclub.com/uploads/1/3/0/7/130776673/367093.pdf
    • http://files.aaawellnessclinic.com/uploads/1/3/0/7/130775137/vomuv.pdf
    • http://files.milanabyinna.com/uploads/1/3/0/7/130775221/1792016.pdf
    • https://cdn.shopify.com/s/files/1/0432/6824/3614/files/cbdt_circular_3_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/tamafepiwisaduzaserowegus.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/lokipamizelubow.pdf
    • https://cdn.shopify.com/s/files/1/0437/9456/3229/files/addition_of_decimals_word_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0458/1163/0246/files/7815447816.pdf
    • https://cdn.shopify.com/s/files/1/0432/5113/8715/files/definition_of_growth_and_development_in_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/moruzamujiwam.pdf
    • https://cdn.shopify.com/s/files/1/0436/0830/9923/files/13836127280.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/seleruribonefilipaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4396/files/vibenedugovefowot.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/vocabulary_exercises_for_intermediate_students.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_off00007461.bin
9e67f886640e52543f52bb3febf9629466179834f780ba7e04977f24943e0c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7461 5064 bytes
font_01_sfnt_off0000856e.bin
1a17eb6c09757bf55dd6ae76a9f4bb503d39407812f75d0cda46e88371f92051
pdf-font-stream PDF embedded font (sfnt) at offset 0x856E 10332 bytes
font_02_sfnt_off0000a904.bin
2f34e2a47881d07bf5e0ddcec7fa78b88f5f828504524ebfdba63e029b22e37e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA904 16100 bytes