Malicious PDF — malware analysis report

Static analysis result for SHA-256 13400796922d7b8e…

MALICIOUS

PDF

48.2 KB Created: 2020-08-06 03:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e963de9732f9abbc102cfab83b2c71 SHA-1: aad8a250125a7ae18d9d5809b26a718c6dc6297c SHA-256: 13400796922d7b8e96c255507a028c3cb1c76f4a2165aeae749effbfa2d1b204
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'volume and surface area of compound shapes worksheet pdf' and includes the malicious URL, suggesting a lure for SEO spam or phishing. 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.ru/pify?keyword=volume+and+surface+area+of+compound+shapes+worksheet+pdf
    • http://files.geraldinepilgrim.com/uploads/1/3/2/8/132815346/6780435.pdf
    • http://files.squashdreamers.org/uploads/1/3/1/6/131607010/xizugepa.pdf
    • http://files.a-teacher-travels.com/uploads/1/3/1/3/131379904/3be2adb84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7105/2707/files/43720953589.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4967/files/22138320432.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/rowobukupes.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/15184500724.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/71069229271.pdf
    • https://cdn.shopify.com/s/files/1/0434/2140/1237/files/37341110256.pdf
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/pivegexadaxeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/80490449195.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/convert._psd_to.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/94940160635.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/31251032293.pdf
    • https://cdn.shopify.com/s/files/1/0433/8414/4037/files/arabic_english_dictionary_hans_wehr.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/83197055144.pdf
    • https://cdn.shopify.com/s/files/1/0437/3286/1079/files/psoriasis_treatment_guidelines.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_off00007de0.bin
d59bcb2a4065867f6c32ab94a6edd3ca3064b90a2c6dc9f8644b496555a13a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE0 5516 bytes
font_01_sfnt_off0000908f.bin
c0e17434ae59a6dd1604073757f29514a7f9d958286877d80137eb49c7977532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x908F 10180 bytes

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