Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fd15dda433c3e7…

MALICIOUS

PDF

48.3 KB Created: 2020-07-31 14:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 131d638e1eec15fd11377a64e372bd15 SHA-1: b2002e59423ec9e05ba0de2a25bf87b781664ab0 SHA-256: e7fd15dda433c3e7706d9759427cdbd47ba7246bcc082624acdd4b778001c4dd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large farm of external PDF links. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no additional context.

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=socialismo+cientifico+pdf
    • http://files.linencanvaspaper.com/uploads/1/3/1/4/131407227/lodetoxikefi-zubawu-wobirukibogo.pdf
    • http://files.nanolab.info/uploads/1/3/1/3/131379749/befuraxigufero.pdf
    • http://files.wpea.org/uploads/1/3/2/6/132682022/dupewumo_fenikekuzibugud_xekojezumo.pdf
    • http://files.wpea.org/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/mixovo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/buxipulurilaleb.pdf
    • https://cdn.shopify.com/s/files/1/0440/0388/5206/files/1635764759.pdf
    • https://cdn.shopify.com/s/files/1/0432/7931/9196/files/vanuredepati.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/39414490601.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/66982861090.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/zudumogo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/66759255783.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/fibimefasojaniruzopaneg.pdf
    • https://cdn.shopify.com/s/files/1/0435/6338/4991/files/gitebomil.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/fozubomijezaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8024/4643/files/rojajabukevobexopasisop.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e45.bin
23ae95ef0e6d5b31a0fbf1e75b2602bbefbf2b935043d091e45689741c83aafb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E45 5096 bytes
font_01_sfnt_off00008f70.bin
2dd8353fed08ca2f077027ece75fba5ec19e938b82aa8231b8fb144c437f035a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F70 10812 bytes