Malicious PDF — malware analysis report

Static analysis result for SHA-256 a470278b4b62b498…

MALICIOUS

PDF

41.7 KB Created: 2020-09-09 20:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcaa8ab08f39261a520e792150c92605 SHA-1: 1f109c9c28deab3b2519bf97d016590ce75bbff0 SHA-256: a470278b4b62b4981b8bce3e47d0959df9f22f7bae7fd93db395d31059d41a5b
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised with a lure related to a 'healthy food guide magazine'. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The PDF also contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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.me/wix?keyword=healthy+food+guide+magazine+nz
    • http://files.southshorejrs.org/uploads/1/3/1/1/131164479/panabi.pdf
    • http://lufiwipaz.jupiterorphan.com/uploads/1/3/0/8/130814017/zudorexil.pdf
    • http://files.mallowkitten.com/uploads/1/3/0/7/130775373/7776110.pdf
    • http://kusanam.slipstreamnewmusic.com/uploads/1/3/0/9/130968961/0d9a6ed2ee.pdf
    • http://files.aaairlines.ca/uploads/1/3/0/8/130813738/8875779.pdf
    • https://cdn.shopify.com/s/files/1/0434/3853/8908/files/anemia_nutricional.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/uim_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0133/files/terezokaxogenetadumevita.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/certificat_de_cession_de_vhicule_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/javojabakunavidop.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4712/files/bejerubekipoweraki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/adelaide_formal_dresses_online_shop.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/javascript_crypto_library.pdf
    • https://cdn.shopify.com/s/files/1/0459/9051/0749/files/free_land_sale_contract_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/interest_rates_in_south_africa.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_off000063a4.bin
b7ca6ec52e9503037e71bb4fc90b171efb9d63756b0df906f37a6a2ce20b8d4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A4 5160 bytes
font_01_sfnt_off00007522.bin
637d68dba7699bb891e8bb6301fa512efeec4e6cca9d8f3544c9d4b59077b898
pdf-font-stream PDF embedded font (sfnt) at offset 0x7522 10972 bytes