Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef7b9dcd0289619…

MALICIOUS

PDF

43.4 KB Created: 2020-08-10 12:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4435196b9f045a97a28addfb2df25378 SHA-1: 963eb1a0023c489c8392330db7fa106dde5327f3 SHA-256: 7ef7b9dcd0289619e8a646e790f67e7b66c6c70f1c03c935016aeb1ad16cd261
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'TCS Bancs architecture'. The presence of a link farm and a malicious redirector suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=tcs+bancs+architecture+pdf
    • http://files.moorishnationpublicrecords.com/uploads/1/3/0/7/130740178/bixaxokimogofu.pdf
    • http://files.hendersonbosley.com/uploads/1/3/1/0/131070501/kalavobofisuz.pdf
    • http://wesodove.bridgeproductiongroup.org/uploads/1/3/1/6/131637814/jasizeseken.pdf
    • http://files.vasalou.net/uploads/1/3/0/7/130738559/6b053f9f7df.pdf
    • http://butetoj.crkeenwoodworking.com/uploads/1/3/1/4/131482975/dojopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0450/7192/5411/files/nutritional_assessment_tools_for_nurses.pdf
    • https://cdn.shopify.com/s/files/1/0436/8017/0137/files/jupafuzivem.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/53620050247.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/9479422636.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/50977601865.pdf
    • https://cdn.shopify.com/s/files/1/0451/4122/9733/files/bachelor_of_accounting_science_unisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/mijikotixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64255738852.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4142/files/algorithms_in_a_nutshell_a_desktop_quick_reference.pdf
    • https://cdn.shopify.com/s/files/1/0428/5284/3676/files/rudomasowap.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/fadopekijidedode.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/nedekavadewugus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/lilapisefoginibisinewug.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d1a.bin
8dd1eea241009a9e5115abe29b39fce134227cfc9ee4901135c82bdd32e3cf69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1A 5072 bytes
font_01_sfnt_off00006e3e.bin
38b0f2dd7e7fa3ff158fbd3bae460fca77b2336449267dabc824df25aebdfb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 10460 bytes
font_02_sfnt_off0000922c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x922C 4324 bytes

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