Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e5033797caaa53…

MALICIOUS

PDF

54.5 KB Created: 2020-07-27 11:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b19e428e8a8e6465732065b1ce9468 SHA-1: b1277a6bd175bd55ef0d7b45fee9a89704e84738 SHA-256: 14e5033797caaa530b06f0dd33ebf4bd070226e533777c95bea56804e2a1afc7
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of numerous external links, including one pointing to a known malicious redirector, suggests an attempt to manipulate search engine results or lead users to harmful content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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=symbolic+interactionism+in+sociology+of+education+pdf
    • http://files.yummypersianbite.com/uploads/1/3/2/6/132695294/7872dbaba702.pdf
    • http://files.429delancy.com/uploads/1/3/0/8/130873708/9778697.pdf
    • http://files.lihmsisters.org/uploads/1/3/0/8/130814085/zoriva-fasaxomufuzo-linowesepuwisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/7084164581.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7966/files/tudezovazeworenanalewes.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/49387947090.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/jopofok.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/pinimonifalobo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/51395387040.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/xajoxegar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/xofetapanitutanunowine.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/pekoxomilik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/weroxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4507/7660/files/fopobalokuneza.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/fetusekafukana.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009740.bin
a20ad3abbc709957a6e947afd543e506c7d795d1ee09df98714cdd2ce4face87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9740 5700 bytes
font_01_sfnt_off0000aa85.bin
bd70518f9054ce32559bd497e9f17022a60bc44041e3cc3de915d3a7ae186b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA85 10040 bytes

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