Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cb85283cb81e83…

MALICIOUS

PDF

51.9 KB Created: 2020-08-06 04:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 342e8471324bee55a5152518a0e2c000 SHA-1: 83134304e2c15ba91e3a1a6ddcd3bb57ede5f545 SHA-256: 36cb85283cb81e83875123e043a29fdd046b224f0253b39f05f344e7fdd01b8b
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though obfuscated, includes the target URL and references 'pdf download', suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful 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.cc/wb?keyword=pattern%20recognition%20theodoridis%20pdf%20download
    • http://files.ameripawnandgun.com/uploads/1/3/0/7/130775563/tikigakewuwori-zobazazavi-zebufijixale-pozalijewa.pdf
    • http://xaboruw.mybutlershop.com/uploads/1/3/2/6/132681579/5364807.pdf
    • http://files.freshairfitness.net/uploads/1/3/0/7/130738892/padominonu.pdf
    • http://files.surgicalassociatesmb.com/uploads/1/3/0/9/130969151/vanulafepavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/79121723733.pdf
    • https://cdn.shopify.com/s/files/1/0437/7057/7045/files/17972298873.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/zevufup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/bipote.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/25578472733.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4375/files/jerofilejajibulakemot.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/60850311964.pdf
    • https://cdn.shopify.com/s/files/1/0434/5846/1863/files/universal_studios_singapore_map_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/komobosam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/didusowegoruvufunewono.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/ylang_ylang_doterra.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_off0000780f.bin
1683cb0a89a38e3c9fd33f0699c8d1acbd98875a4c248dbbff938922396c23cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780F 5508 bytes
font_01_sfnt_off00008ad8.bin
d018391168998a9ca6d585d9034ae2344f81c50a241e6dab0d1414a4cac0279b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD8 18076 bytes

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