Malicious PDF — malware analysis report

Static analysis result for SHA-256 7139747c5b42f651…

MALICIOUS

PDF

55.5 KB Created: 2020-08-29 20:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 367cd339c93d44acd2ecee8f7d8c1d19 SHA-1: 879352c1ae9afed1946af2797b0c7cca023c3dfc SHA-256: 7139747c5b42f65137b69f1b69ea76f0ade1fcf58c72ab5d9fa1a6aca65097d4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or lure users to malicious sites.

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/wix?keyword=el+calafate+travel+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_9bfe05a77a1b4d5eabd0d05d04a283b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe9d8082320a4ceab11390cfd2e64385.pdf
    • https://static.usrfiles.com/ugd/e8506d_96aea3938a7b486cbf5d1bfa6d1d7c7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8acb103638da477987d634ea67792e25.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0f500d713148e38461148786b0980f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a137896d67c4e77980d30d20b4a3800.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb642f2e8f87472d92571b067a601cef.pdf
    • https://static.usrfiles.com/ugd/b8c837_3613a9d2513a4ce6bbefef911945bafe.pdf
    • https://static.usrfiles.com/ugd/5ed537_f2307db817e74ea8bcfa9f9657a2b2f3.pdf
    • https://cdn.shopify.com/s/files/1/0433/2699/6633/files/76828471539.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/44375792331.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/11714737600.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/vinunanuf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5dee3ed256d4d3ba68fd5e3a17e7059.pdf
    • https://static.usrfiles.com/ugd/87a178_b5e1831efb0d4f8fb4e00e8358c12d55.pdf
    • https://static.usrfiles.com/ugd/b8c837_78933278833e4d14aec1e5388937cc2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a87f0d5593a7457ca7090e568513af58.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f859ae14ad842668a2045c447be4da2.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_off00007622.bin
f577ebf996628974617855937cdfdef1683b71b307d805627bbe1df0ccfecbd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7622 4692 bytes
font_01_sfnt_off0000862d.bin
ace26c75636567bbe1f85996854d1c1960bafc27b2a0dd2af447c76c0f7dd0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x862D 10516 bytes
font_02_sfnt_off0000aa2e.bin
b29db41b9abf1283e5917ed084e385b1300f15a5043abbe2a8d05d7550163896		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2E 17184 bytes
font_03_sfnt_off0000c26f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC26F 4324 bytes

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