Malicious PDF — malware analysis report

Static analysis result for SHA-256 e054c3e281167044…

MALICIOUS

PDF

51.2 KB Created: 2020-08-09 10:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f879ca1df776c180a70384317e435512 SHA-1: 501874192b67a6d52836137ee191d186d66b36b2 SHA-256: e054c3e28116704455df3c70b567cb434c556f2c635885218cf97de923034323
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this is a link farm designed to manipulate SEO or redirect users. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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=palmistry+in+bengali+language+pdf
    • http://files.livrelit.com/uploads/1/3/1/4/131482832/1570b0716c.pdf
    • http://files.krethcattle.com/uploads/1/3/2/6/132681452/fededon-jaxumu-dinajotinudibad-mujiwi.pdf
    • http://files.piecemakersquiltshop.com/uploads/1/3/1/4/131453698/8220705.pdf
    • http://files.songmountainwushu.com/uploads/1/3/0/7/130776265/e718dbcbde8508.pdf
    • http://files.bellacalore.com/uploads/1/3/0/8/130814279/mumubimogamu-fupedevumebat-ropetiwajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/romijifajutezosebi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6808/8742/files/mijefebobewikikelexusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6502/4412/files/aptitude_test_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/75167321193.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/fosotixigepuwevenu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/bhagavad_gita_livro_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3427/9062/files/fogomesulilabatamubite.pdf
    • https://cdn.shopify.com/s/files/1/0438/2602/0509/files/voluropex.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/zukadajofubudonolivuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/7050/2550/files/75787667620.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000716c.bin
09d96cf1eeff6a155b475192b3631f8ba71993c36d640f70a0ead3b7a619e349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716C 7248 bytes
font_01_sfnt_off0000895d.bin
0920816156cfc53ce65c1d96129fb9f2dba35566854497c2d7fbc9979d3b24f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x895D 5604 bytes
font_02_sfnt_off00009c5d.bin
238f7ce95f1f1a0df9659ab4979b6883421778fac6c9fbbeba263d9304b075b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5D 10324 bytes

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