Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a35b7c883794e76…

MALICIOUS

PDF

46.1 KB Created: 2020-08-22 20:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa275a1c1ddd4992d5b100022ffe539d SHA-1: b1769d9cecb004c91e64f02ecca8d873a9f598b7 SHA-256: 5a35b7c883794e76a26287908fc6b1ec3813bb252784de66426c5cfed427147b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting an attempt to lure users to malicious infrastructure. 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=arya+2+songs++in+malayalam
    • http://files.thesecretplaceactorsstudio.com/uploads/1/3/1/4/131437977/1d51dc.pdf
    • http://files.hondontv.es/uploads/1/3/2/6/132682607/7901280.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/serananovuja.pdf
    • https://cdn.shopify.com/s/files/1/0465/0873/6662/files/cholera_disease_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/kik_on_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogudanivivakow.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/45280268323.pdf
    • https://cdn.shopify.com/s/files/1/0439/1573/9304/files/10817738413.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2928/files/kakoluferi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3423/0429/files/vapipav.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9654/files/83805854255.pdf
    • https://cdn.shopify.com/s/files/1/0438/5072/7584/files/common_source_fet_amplifier_theory.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/nutatitufatizozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5242/files/10920947565.pdf
    • https://cdn.shopify.com/s/files/1/0445/1749/0847/files/ruditek.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/76874053100.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_off0000702d.bin
53339dd64860d2d22fd7614e5ef3d61aa3e5eb035e5c12187854ddb0477ebad7
pdf-font-stream PDF embedded font (sfnt) at offset 0x702D 5228 bytes
font_01_sfnt_off000081e5.bin
4a5c9bdfca491cf07b3715feab015fdbfc42d6714645de7589d881a73ad4cd18
pdf-font-stream PDF embedded font (sfnt) at offset 0x81E5 12636 bytes