Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8c0ae008b54284…

MALICIOUS

PDF

48.9 KB Created: 2020-08-20 00:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e82068342f42b2157bd9eb783c156288 SHA-1: 22296165352d0db85139bc9ed5ec74237fbe970b SHA-256: 7b8c0ae008b542840c3b1d594015f0238fdef32cc75231b0cc9139c9447b848d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

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=affidavit+letter+for+immigration+marriage+example+pdf
    • http://files.cravecavelv.com/uploads/1/3/1/3/131380305/665122.pdf
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdf
    • http://fozeg.thecottageatcedarburg.com/uploads/1/3/0/8/130813765/gakilakeb_kijejelaxil_lifegaf.pdf
    • http://files.david-heath.info/uploads/1/3/0/7/130776103/diretaxet.pdf
    • http://wedokixan.buytopiary.com/uploads/1/3/1/1/131164250/panujakumepiko_fepugozirekaji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/69531721885.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/93196387367.pdf
    • https://cdn.shopify.com/s/files/1/0433/5186/7557/files/bronkitis_pada_bayi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/dotevorofefufanadugumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/xowubadegizamal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/vekurajemagizefagafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/51130949636.pdf
    • https://cdn.shopify.com/s/files/1/0449/6916/4968/files/crash_fever_wizard_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/5026/9849/files/addition_table_worksheet_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0454/7097/4118/files/lego_harry_potter_ps4_guide_trophe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/46338727975.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000743f.bin
c697bdbee8725493df2d17ae12291e0dc090e578365e85d57d9f88327aa1f09a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743F 5088 bytes
font_01_sfnt_off00008577.bin
8bc4d5bccedbb0db2c0f526b63c9d6d7edf2b11d45a892f0088991f2c705222e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8577 10072 bytes
font_02_sfnt_off0000a7f8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F8 4324 bytes

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