Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dc452856de59ee…

MALICIOUS

PDF

48.2 KB Created: 2020-08-03 11:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dad545334272989199c93bd7b126b1f0 SHA-1: 60abee2614fb04c0e8ffb8d3f61994b771c9de27 SHA-256: 35dc452856de59ee2f60fb0c64d6f2d6f941aa19e1dce7cbfa6e47d8a1bcf04f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to lure users into clicking on what appears to be a legitimate document, but redirects to malicious infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=interpersonal+therapy+manual+pdf. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a SEO-based lure to drive traffic to potentially harmful sites.

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=interpersonal+therapy+manual+pdf
    • http://files.carmelmusiccenter.com/uploads/1/3/0/7/130776745/5a8f62d7af1.pdf
    • http://files.bluemantaswimming.com/uploads/1/3/1/3/131380342/5fdd29.pdf
    • http://files.cultivatemusicstudio.com/uploads/1/3/2/6/132696128/6a231377.pdf
    • http://files.thevibrantauthor.com/uploads/1/3/1/3/131378838/bopokapeviv.pdf
    • http://files.essentialleighsimple.com/uploads/1/3/2/6/132696171/vabivukaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/mijaperib.pdf
    • https://cdn.shopify.com/s/files/1/0440/6735/6824/files/rapugikaguxejonuzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3115/8175/files/college_physics_a_strategic_approach_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/1670/5432/files/tenobiwow.pdf
    • https://cdn.shopify.com/s/files/1/0438/4381/3538/files/jabukisapikivunej.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6285/files/puzur.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0899/files/sonajowaruvivutugaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/2518/5442/files/70305830876.pdf
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/zovemobegebimoxedule.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/71522010840.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/68035958959.pdf
    • https://cdn.shopify.com/s/files/1/0432/2682/4863/files/kozew.pdf
    • https://cdn.shopify.com/s/files/1/0431/1869/0458/files/43975523736.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_off00007f69.bin
f2c18e85a33da8c1f6b4bf06818b7d68544823235b3986e307a27604f66fc5a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F69 5320 bytes
font_01_sfnt_off00009157.bin
671662e2fadc63c81c810ed1a5f2bcbc7ab975fd22f8bd1e0c624bb9f409e956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9157 10188 bytes

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