Malicious PDF — malware analysis report

Static analysis result for SHA-256 3857270a20d9917a…

MALICIOUS

PDF

50.6 KB Created: 2020-08-07 08:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 317a6307faa2165944ce1a08db5f97c9 SHA-1: ccc234bdae9d6142555434ff75954393d55df06f SHA-256: 3857270a20d9917aa77a132706730f7504f295dcd375fca39901f0c986d6fe19
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though obfuscated, contains text related to 'metallography of aluminum alloys pdf' and embedded URLs, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=metallography+of+aluminum+alloys+pdf
    • http://wakoxa.ninjaprite.com/uploads/1/3/2/6/132681504/9039192.pdf
    • http://files.myguillermofloresuagro.net/uploads/1/3/1/4/131407067/duzuzanuxawomoz.pdf
    • http://files.auntiejaniceentertainment.com/uploads/1/3/1/3/131379456/7282407.pdf
    • http://files.lifteverystudent.com/uploads/1/3/2/8/132814146/d9ada9f85.pdf
    • http://files.kanecountystormwaterupdate.org/uploads/1/3/0/7/130775009/0684c8.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90296180399.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/jekibumabilivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/tefotegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/pejezexaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/descargar_antecedentes_contraloria.pdf
    • https://cdn.shopify.com/s/files/1/0433/1978/7675/files/69652424046.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/lekakujoresuxinon.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/bowarasajisewapot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/wibugamo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8130/2167/files/bilemuzorozopiweki.pdf
    • https://cdn.shopify.com/s/files/1/0454/6029/1742/files/cariotipo_normal.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/pigetuworibuborezalupu.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_off000086ca.bin
851fb61deaa826ca3481662f97b2e0e17cd2f668783672b4becf306c20cc2f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CA 5560 bytes
font_01_sfnt_off0000999d.bin
d4bb5770af4371efe87af867d4e8f5c9eb1564e7263be1f056c2e32e7966e85c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x999D 10436 bytes

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