Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c1d129dd409c2a…

MALICIOUS

PDF

34.3 KB Created: 2020-08-17 11:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb5e7e734032658313e7596e8f632483 SHA-1: bcdca5e4b78fecdb202aa8ab140d9b98ca985561 SHA-256: 26c1d129dd409c2abbb5a6d4ae972a7b2b9c0535c74e8b1f392807d7b82dfc6f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm or redirector, likely intended to lead users to malicious content or for SEO manipulation. No scripts were extracted from this sample.

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=ecologia+de+bosques+tropicales+pdf
    • http://files.lauramernoff.com/uploads/1/3/2/6/132682819/1835030.pdf
    • http://gawopimir.readingandspellingtutor.com/uploads/1/3/1/1/131164250/gozukorik.pdf
    • http://dimix.cengledesigns.com/uploads/1/3/2/6/132683001/7dc81a3bc0bacd0.pdf
    • http://mipaxe.petethepermie.com.au/uploads/1/3/0/7/130739240/podub-xedegogamero-bogavizeg-ziragovekadewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8837/files/42521956871.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/8029323080.pdf
    • https://cdn.shopify.com/s/files/1/0430/9408/1687/files/12800126196.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/pitigataxuguzez.pdf
    • https://cdn.shopify.com/s/files/1/0432/5474/3200/files/77606974980.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5409/files/ejercicios_de_perspectiva_caballera.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/22358801333.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/brush_calligraphy_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/xulepipatinuxepimukite.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5621/files/kexivifezafozajubusezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/19412940148.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_off00004831.bin
21f90009c9cebe841d8ff023ba39ec086dc22b68f025e63d811f381e93cc4fb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4831 5544 bytes
font_01_sfnt_off00005b03.bin
243199292fa16fae7ebc9927b6226bdb7de17c6a80a079f1fbe70b23b5dabbb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B03 9844 bytes