Malicious PDF — malware analysis report

Static analysis result for SHA-256 355b28f3132e39ba…

MALICIOUS

PDF

56.9 KB Created: 2020-08-10 02:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27b97c77a5dbe79faec1405901006e2 SHA-1: 0105c511c64a5af8c96f8cc5b3c19295742f2472 SHA-256: 355b28f3132e39ba8df37fa788302029a8a36c597dd00049912f24e38ef90fdf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a lure related to 'baby names boy tamil list pdf' and embeds multiple external links. One of these links, 'https://ttraff.com/pify?keyword=baby+names+boy+tamil+list+pdf', is identified as a known malicious redirector. The document body is heavily obfuscated, but the presence of the malicious redirector and the link farm heuristic strongly suggest a phishing or redirection attack. The ML classifier also flagged this PDF with high confidence.

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=baby+names+boy+tamil+list+pdf
    • http://files.extensionslashnbrow.com/uploads/1/3/1/4/131455024/dirotezawuga_xobukirukile_banisujirenimeb.pdf
    • http://files.hulstproperties.com/uploads/1/3/0/7/130739922/5252605.pdf
    • http://files.tillsonbugger.com/uploads/1/3/0/7/130774979/2e0e576.pdf
    • http://files.coveyoak.com/uploads/1/3/1/4/131437157/1178138.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/36537569630.pdf
    • https://cdn.shopify.com/s/files/1/0438/6694/7744/files/aprendizaje_colaborativo_segun_piaget.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/ladder_logic_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0437/2951/8746/files/legojajikitasuwipute.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/buzizobeseser.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zijilo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevimofurerofujasopam.pdf
    • https://cdn.shopify.com/s/files/1/0436/6378/6137/files/64051763827.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/git_hard_pull.pdf
    • https://cdn.shopify.com/s/files/1/0437/9036/8929/files/rexawomodonubidutuxateti.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/appraisal_and_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/vocabulary_words_for_ssc.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/sociology_book_for_css.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
stream_004_off00008fca.bin
a3ec1024171573805b93728287290b6bb48a39978c2ed3cec84521c522ef9c61		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8FCA 14352 bytes
font_00_sfnt_off00007d8c.bin
eda11ef350cd2a34c5fe30ca1c155aecf174c234d3c90ef82092e55ed06935dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8C 5380 bytes
font_02_sfnt_off0000b41c.bin
6df6f4bd9df5dc7601fff074ae927e0171f0d061a59c7145bac598a04168793e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41C 9908 bytes

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