Malicious PDF — malware analysis report

Static analysis result for SHA-256 0415ed0099873f3d…

MALICIOUS

PDF

61.7 KB Created: 2020-08-04 02:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a93dd5d3bc48eb62df6be606bb6a9e2e SHA-1: ff4cabf41cd27633830aab71f984ac5a2edcfda2 SHA-256: 0415ed0099873f3d63a49c1402162c3dce9a60d51b1854c8d1596f51b4208010
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a malicious redirector disguised as a search result for a PDF document. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to be junk data, but the presence of the malicious URL is the primary indicator of compromise.

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=sejarah+agama+di+indonesia+pdf
    • http://files.marthaproject.com/uploads/1/3/0/7/130776864/4405407.pdf
    • http://files.monarch-creations.com/uploads/1/3/2/6/132683000/lisogo_mewano.pdf
    • http://files.ashma.studio/uploads/1/3/0/7/130739742/3518495.pdf
    • http://files.nurturefamilychiropractic.com/uploads/1/3/1/1/131164520/580ee1a599a9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/memoxexepafuto.pdf
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/zawekexenorutivozijo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/bozalebupuvenixabefodu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/kagelaxiwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/32874054583.pdf
    • https://cdn.shopify.com/s/files/1/0431/5771/7152/files/jidotetulepajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/51378717526.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/jukebowevun.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/renozafeteza.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ee.bin
fc0f085e0458371eb3d20e827a1e7351329ebe6fb0ed02a162839f5b24722367
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 5604 bytes
font_01_sfnt_off0000c6d7.bin
0b263d6615cad9bbed6ccb6b59f441e498a2432809914530c4b3466e5770e9da
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 10344 bytes