Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3eca3aabe31887…

MALICIOUS

PDF

44.3 KB Created: 2020-08-10 13:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f955a86ecbc2d74679c45859e4a4929b SHA-1: 94850b14226a649d33acdc0333356d393be19068 SHA-256: cb3eca3aabe3188782f127fedbea3f9e3fcb9b0ddd0119fe3fb51c41ccadfb12
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, including the malicious redirector URL, suggesting an attempt to disguise the malicious intent. No scripts were extracted from this sample.

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=ceiba+pentandra+pdf
    • http://files.simplydivinesuds.com/uploads/1/3/1/4/131407812/23f3d849.pdf
    • http://files.sweetspotstrategies.com/uploads/1/3/0/9/130969404/tenor_nexit_tojujerekivo.pdf
    • http://files.arief-online.com/uploads/1/3/0/8/130874146/5724894.pdf
    • http://files.lizzynorcott.com/uploads/1/3/2/8/132815054/76944c6df99f33.pdf
    • https://cdn.shopify.com/s/files/1/0434/2192/5525/files/31720366259.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/jcl_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/38185626064.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/defense_language_proficiency_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/jeruterowawuzaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/libirud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/super_mario_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/zomaga.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/vemedotokodubegotenemare.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6214/files/83528373045.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/giwewopevarokibujofikaduw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/18206224588.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/83775115510.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007083.bin
bf52af77545b193ef5429bf1dbd7bdbabeb9fc47077e209d29ff0875fa5c425d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7083 4868 bytes
font_01_sfnt_off00008112.bin
c356f428de5cc441e88efac7086b2ac28e84fbf201e3160de40b7a70d5399be4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8112 10456 bytes