Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe49985972610240…

MALICIOUS

PDF

52.9 KB Created: 2020-08-09 20:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e494ab433c512a0bbf1c096d9c057d5c SHA-1: 5fbd21dd1710ede9f52dbd3a9c3d331a1254cdc9 SHA-256: fe4998597261024030b69d3ecb6571bd05f6999d30314af0c724a867be91f13b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. The primary redirector URL is https://ttraff.cc/pify?keyword=class+11+cbse+biology+text+book+pdf, which is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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=class+11+cbse+biology+text+book+pdf
    • http://tonof.schizy.org/uploads/1/3/0/8/130814297/libaberinarof_bujawipis_bovejutizexo.pdf
    • http://files.l912f.org/uploads/1/3/1/3/131383305/gonugiguf.pdf
    • http://files.sunofabeachpearls.com/uploads/1/3/1/0/131071067/0b8925972.pdf
    • http://files.startuppower.co/uploads/1/3/0/7/130739678/253bce1090b.pdf
    • http://felupij.justineneves.com/uploads/1/3/2/6/132681513/3759735.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/moritaponobubipodi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6351/files/bozeri.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5242/files/60760429742.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3888/files/jotatamosujarume.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0643/files/kalagabuzopovemixudoge.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3335/files/wekadexomemefi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8508/6364/files/gifataxufofulukadide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3831/files/bexezisegotepovofazobus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0099/5741/files/82966935328.pdf
    • https://cdn.shopify.com/s/files/1/0435/0168/2843/files/southern_african_history.pdf
    • https://cdn.shopify.com/s/files/1/0436/3495/0304/files/laluj.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/zipeduxetezijomu.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_off00008f85.bin
df521854ab0fb04361696e6a5b8b11bcad90beeb3d78f4ad7852bac83e215757
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F85 5560 bytes
font_01_sfnt_off0000a297.bin
0656c2c8fdbe37dd0d39adeb6b0163d6cc27b5c833b2da7d79590161c6508091
pdf-font-stream PDF embedded font (sfnt) at offset 0xA297 10436 bytes