Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de96627a01ee0f0…

MALICIOUS

PDF

46.4 KB Created: 2020-08-15 12:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0dd477bb20bc727db9389b830b51e3d SHA-1: a3a5f652328aca410865e22d502c4e0b23820c88 SHA-256: 7de96627a01ee0f06ea6d80d692e367b1769f53267d002733122446409acb7ca
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to "surviving sepsis 2018 guidelines pdf" and a URL that appears to be a search result, suggesting a lure to trick users into clicking. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=surviving%20sepsis%202018%20guidelines%20pdf
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdf
    • http://files.trureflectionsbybettina.com/uploads/1/3/0/8/130874246/ferimumagoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/litepaguvezifixi.pdf
    • https://cdn.shopify.com/s/files/1/0443/0397/4556/files/winchester_model_12_manual.pdf
    • https://cdn.shopify.com/s/files/1/0447/8962/9079/files/89311057070.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/zoxezofadejo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/math_worksheets_for_grade_2_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/20278455178.pdf
    • https://cdn.shopify.com/s/files/1/0445/8338/7295/files/betuxixewinogad.pdf
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/biology_notes_for_class_9_icse.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/caries_dental_articulos_cientificos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8906/8185/files/behringer_xr18_edit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikujolam.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/46079851853.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/78302154513.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_off00006886.bin
12f3137d2aa9e0080420796de2cdf8848f82a7af2d97c392d4aab1587ea87001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6886 5372 bytes
font_01_sfnt_off00007ad6.bin
d90a3423d18b33f44435efe92f2663888f7248d8c7e87c6ec6312b533d3fb859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD6 10752 bytes
font_02_sfnt_off00009edf.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDF 4324 bytes

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