Malicious PDF — malware analysis report

Static analysis result for SHA-256 3673cae04ecedb4f…

MALICIOUS

PDF

56.8 KB Created: 2020-08-12 04:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 093f0285e0a2021ef14ae4a44dae3a61 SHA-1: 2740eb539e9486232ec5e13b3457b5c277c7b3fa SHA-256: 3673cae04ecedb4f99e170b0ffb3a36c4beccd1fc68bf697984c427439137c4e
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'Avon catalog'. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.com/pify?keyword=catalogo+avon+campa%25C3%25B1a+9+2020+mexico+pdf
    • http://files.merizzi-psychotherapy.com/uploads/1/3/1/4/131453143/cf8e15c4a.pdf
    • http://files.suetastic.com/uploads/1/3/0/7/130740551/1608866.pdf
    • http://puvazexe.spinteesprints.com/uploads/1/3/1/8/131871721/sifemowamil.pdf
    • http://files.sudburyrocksmarathon.com/uploads/1/3/1/4/131483143/0845ecd8d1de.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/dawedodifojanafapug.pdf
    • https://cdn.shopify.com/s/files/1/0455/7878/0837/files/13942610255.pdf
    • https://cdn.shopify.com/s/files/1/0438/5865/7430/files/class_11_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9494/files/binary_search_tree_iterator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98455436519.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/alphabet_letters_images.pdf
    • https://cdn.shopify.com/s/files/1/0430/5856/1173/files/paganini_caprice_24.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1265/files/piwofipotonekadanezulud.pdf
    • https://cdn.shopify.com/s/files/1/0431/5886/4028/files/95438666393.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_off00008ef7.bin
23b63fe30b676884e51f1c339cd8bdbf2ac1aea15db391d1525fd0c9437d90ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF7 5876 bytes
font_01_sfnt_off0000a2bb.bin
bcadb590ef76fd393fff9ba40416c514afffe97d4ee9fa16048e03b28e31e704
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2BB 16520 bytes