Malicious PDF — malware analysis report

Static analysis result for SHA-256 6017a26f3e449c82…

MALICIOUS

PDF

34.5 KB Created: 2020-08-09 19:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c583d8dd5668f5b90dfb512612cc7418 SHA-1: 1f4bd1182538ece2956ac84dc30281b10686b297 SHA-256: 6017a26f3e449c829212f78a873564dace16d5e35b2f71f66e358a0b553dcd26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though partially obfuscated, includes a URL that appears to be a lure for downloading a PDF. The ML classifier also strongly indicated maliciousness.

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=aladdin+disney+story+book+pdf
    • http://files.corsettiparalegal.com/uploads/1/3/1/6/131606396/bazizorotovofa_depivokiporuwu.pdf
    • http://files.trashstress.com/uploads/1/3/1/4/131437883/915851.pdf
    • http://files.amhcsexualassaultservices.org/uploads/1/3/1/8/131871864/sinatuw.pdf
    • http://files.laurencedeadionneart.com/uploads/1/3/1/4/131437074/5642655.pdf
    • http://vosipawu.baarleproeft.com/uploads/1/3/2/3/132302921/roxena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/xivir.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/chromosome_abnormalities_and_genetic_counseling.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/pewikiporuzutobamepuzoxit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7768/8743/files/70869973426.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/craftsman_eager_1_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9382/files/fonebu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/mugexejodagisimux.pdf
    • https://cdn.shopify.com/s/files/1/0455/4902/7493/files/brooklyn_zip_code_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/nofesojujunagiparok.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8271/files/gapupubijolomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5864/files/next_3d_launcher.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4134/files/pepofawavudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9249/2963/files/52589313014.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_off00004934.bin
e8557adace5e41dd75d43b9fac09c6f562d73052615ced44e7d57f947f906f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4934 5332 bytes
font_01_sfnt_off00005b66.bin
322cfdc219ebd0139d87315541afdb8e4e7e260b2c6cb4c77cd8453e8744409d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B66 9948 bytes

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