Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9cf43b63579eb7…

MALICIOUS

PDF

51.8 KB Created: 2020-09-01 01:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7254eaec25d1ef63734d736c0b6f56c SHA-1: bec9e41bdfa19e84168af25f872c17f9a7bd5738 SHA-256: 7b9cf43b63579eb7b7c521fbf091dc3c530a3fe64b254bdf5a549c66efe5e6f7
154 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, `https://ttraff.cc/wix?keyword=bilyoner+apk+indir+2019`, which is likely intended to lead the user to a malicious download or phishing page. The document also contains a large number of links to other PDFs hosted on Shopify and static user file sites, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. No scripts were extracted, but the presence of embedded URLs and the heuristic firings strongly indicate a malicious intent to redirect users to harmful content.

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/wix?keyword=bilyoner+apk+indir+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/3054/3512/files/81920590724.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2323/files/39624498832.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/real_bluetooth_hacker_for_android.pdf
    • https://static.usrfiles.com/ugd/3aca14_2f14eddbd34e47b0afbd7069101298ea.pdf
    • https://static.usrfiles.com/ugd/e5a943_54ac23e6c9fc4e2984472a30d05c03f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2f540c36f1c48febaffc0d2ab13633a.pdf
    • https://static.usrfiles.com/ugd/19103d_926d0242886e43c1a09b507f0dc2a950.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/33258690288.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0008/files/34392574742.pdf
    • https://cdn.shopify.com/s/files/1/0462/5301/5189/files/83472305799.pdf
    • https://cdn.shopify.com/s/files/1/0451/1835/7669/files/algebra_definition_and_examples.pdf
    • https://static.usrfiles.com/ugd/8b49c6_794c874e3dd74f19a8a5590d0c9f1193.pdf
    • https://static.usrfiles.com/ugd/74c34a_0526e56e6a824a499e6655ee79925bc2.pdf
    • https://static.usrfiles.com/ugd/67e251_e515b97909a048de94a506a9ba0626c7.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066bf.bin
3121557a217a2589214ab1fc9eef26f115fbbda70d3503c849ae1bda20f249d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BF 5180 bytes
font_01_sfnt_off0000785f.bin
d0d3c45599f377bb601c32460f2a827cd75e1255464061765f67d8d1d8593b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785F 11828 bytes
font_02_sfnt_off00009d4d.bin
53c3ec829963ec5a0af1bff4be2d724acb9959b277e5253d769434e6be684fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D4D 16160 bytes
font_03_sfnt_off0000b256.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB256 4324 bytes

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