Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dbc4524e00a292…

MALICIOUS

PDF

66.7 KB Created: 2020-08-06 21:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20747908070a26ace7a620414c77adf6 SHA-1: 6359696492f74504e51bdf3ffc31a2e24a256a0d SHA-256: 99dbc4524e00a292d3a0cb5170e4b1e56cdf662caa96293309d2c7efe2382127
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=cancer+pulmonar+epidemiologia+pdf
    • http://zuvizeri.fccbluffcity.com/uploads/1/3/0/7/130775795/3670348.pdf
    • http://files.essentialoils4people-n-pets.com/uploads/1/3/1/4/131438819/nagesemuzikibubeti.pdf
    • http://files.harderartprints.com/uploads/1/3/1/4/131407080/661addc30a4818.pdf
    • http://files.carolinachildrenstheatre.com/uploads/1/3/1/4/131452938/3298903.pdf
    • https://cdn.shopify.com/s/files/1/0440/7921/8838/files/soccer_tryout_evaluation_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/caller_id_theme.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8042/files/niturulisorararoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulanevu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/datifulumologekojaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4292/files/mezejibizaguxugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/lexalugomolomezez.pdf
    • https://cdn.shopify.com/s/files/1/0440/4497/6278/files/mivobirixitib.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/1480709075.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb22.bin
ec3dbf684839b38c862e4fc1e89ef05dbcc2b7cdbc95176c9174eeca25b057be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 5120 bytes
font_01_sfnt_off0000cc71.bin
1281c2f93bb0e4eaaf740127b43b86cc7012bc2f15bef76bf1963d2152af3ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 10208 bytes
font_02_sfnt_off0000ef6e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 4324 bytes

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