Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb7c85a2b937a63…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 13:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7f4cad3141072deb984de573859de1c SHA-1: 665676c90629757c6d1334174af3620a3b178035 SHA-256: aeb7c85a2b937a63031145f6a5538753af25b9c95916a7656447f0d4d305ffe5
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of these links, 'https://ttraff.com/wix?keyword=revelation+its+grand+climax+at+hand', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL.

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.com/wix?keyword=revelation+its+grand+climax+at+hand
    • https://static.usrfiles.com/ugd/5b5da7_49748578b3ba4051958c8b61808774b2.pdf
    • https://static.usrfiles.com/ugd/3b47cb_bd0fda67fd2348e5a29e39f6fb4006ad.pdf
    • https://static.usrfiles.com/ugd/09273f_3c721edccda04cc29f9fc7ecf8741ceb.pdf
    • https://static.usrfiles.com/ugd/b8c837_58fdfc4a8f1b44278fbdad7c90667232.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/memedizil.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/gadavi.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/tamil_language_learning_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6322/files/47924408688.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/76166551963.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bisadugizutojaririxenudep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4156/2522/files/australia_the_shins_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/vexuxiwiwikoguruvuxuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/35703541737.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/candlesticks_in_forex.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_off000052a5.bin
3c805b119abf1c01f5a42a03e967831c903ae54f2f14b782529db45e63c2ce89
pdf-font-stream PDF embedded font (sfnt) at offset 0x52A5 5276 bytes
font_01_sfnt_off00006472.bin
6fdd4449ec2799b15e8faaff87e01dab8522b2997a0af5dc6af671e851da5cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6472 10120 bytes
font_02_sfnt_off00008714.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x8714 4324 bytes