Malicious PDF — malware analysis report

Static analysis result for SHA-256 a308b78b93db3dc3…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 02:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af06be136c7b88565b20fe71110772f SHA-1: 3a5e84971af7fcf7c61f7594debd8c75b12bece9 SHA-256: a308b78b93db3dc3dae2b6006d9a0eddfa1ecf8d60d33454cbe223be4bbfde4c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious link identified is https://ttraff.ru/pify?keyword=museum+exhibition+design+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to drive traffic to malicious infrastructure.

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=museum+exhibition+design+pdf
    • http://jelar.hickmanfootball.com/uploads/1/3/1/4/131437044/xineli_tiwumimagivaraf_xazubaxeraxalun_tebuwiwim.pdf
    • http://files.tohsgirlsvolleyball.org/uploads/1/3/1/4/131452958/764ef54f876.pdf
    • http://piruwevi.pilaracevedo.com/uploads/1/3/0/8/130874284/letovoziluwow.pdf
    • http://files.myuntoldpleasures.com/uploads/1/3/1/0/131071166/zebenilusufoko.pdf
    • http://files.islandgirlislamorada.com/uploads/1/3/2/7/132740234/pufikeverusela.pdf
    • https://cdn.shopify.com/s/files/1/0448/0948/6498/files/2017_subaru_outback_owner_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8102/files/punovutinonobegaxux.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/woxumuligumava.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/sezimakamiselivaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/joloje.pdf
    • https://cdn.shopify.com/s/files/1/0431/6774/4160/files/nupedezebufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jewepogepavab.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/84945170312.pdf
    • https://cdn.shopify.com/s/files/1/0441/2456/9752/files/93215950367.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/risadupuvelamuwesujeza.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/peginekamilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/algebra_1_holt_mcdougal.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_off00006c5f.bin
d1a4daffcf1b8dbef84c01e95182bce3663559bbb2cf05d3982b987e29ebd38b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5F 5328 bytes
font_01_sfnt_off00007e6c.bin
fa96f98ee2cec86f1789b6011af7440b62762a7c4042069e451e6c1d05b1105a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6C 10356 bytes

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