Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cddc2e0b873a52…

MALICIOUS

PDF

96.2 KB Created: 2020-08-08 15:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd7d7768979846bdcb40bac403d0ab88 SHA-1: 729988d413df6573dc3f3c284f1b3ac2e28ef6c4 SHA-256: 87cddc2e0b873a52167f7c29755ac49b7b1002ab7a762cd9b2547740c6f09710
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious 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.ru/pify?keyword=bernoulli+equation+fluid+mechanics+pdf
    • http://temipa.modtone.net/uploads/1/3/0/7/130738848/xiwikunizape-japase-lonoxus.pdf
    • http://nometiw.kristihoopes.com/uploads/1/3/2/3/132303382/sutetazup.pdf
    • http://nopamus.scissorandcomb.net/uploads/1/3/1/3/131384635/5238cb4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/kekozurofadeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/galetarupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/ninufijusugemuxejinitut.pdf
    • https://cdn.shopify.com/s/files/1/0438/9352/2587/files/44196390316.pdf
    • https://cdn.shopify.com/s/files/1/0437/3869/3797/files/25692085479.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5772/files/levizoretexus.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/future_jersey_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/35296413186.pdf
    • https://cdn.shopify.com/s/files/1/0434/7586/1656/files/keremitowegupenabalevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/50738827405.pdf
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/sedetalak.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119cc.bin
9e8daddce4621414a1bf16f66da3395102db4b577dcc2bb6d67fa33f44bbb2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 5568 bytes
font_01_sfnt_off00012c99.bin
ea7da029be2f15e94cbfcb15d1c58d9d03c20dfe0155914201aa7950b065664d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 15636 bytes
font_02_sfnt_off00015e17.bin
647fa2c693c8ab21cc25743b8708e2ebf080f540c0660d69714ab6ec7e0111fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E17 16108 bytes

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