Malicious PDF — malware analysis report

Static analysis result for SHA-256 14336de94187356f…

MALICIOUS

PDF

40.9 KB Created: 2020-08-25 02:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5323dbe36acafdafec90c04f7c0121dc SHA-1: 4126bfaed735f1cf2698f096674e84c6672ce566 SHA-256: 14336de94187356f4858181222f10d5eb29135bb2220edff9bdb347ebf1cb0cd
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to what appears to be a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=android+studio+logcat+limit'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of this redirection scheme.

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=android+studio+logcat+limit
    • http://files.loganloves.org/uploads/1/3/1/4/131452887/7045448.pdf
    • http://files.theyellowjacket.com/uploads/1/3/2/8/132815767/xoked_babexula_diruzuga_pidexexupenu.pdf
    • http://files.jackandjos.com/uploads/1/3/2/7/132712326/ninivunatuden-finapezor-toxobamuxos.pdf
    • http://jepitiz.abhyasayogabelfast.com/uploads/1/3/1/4/131407668/gigaxoxofufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7940/9568/files/bsc_inorganic_chemistry_practical_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/black_desert_sorc_build.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/relixoguxowefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7957/3414/files/adverb_and_its_type_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0449/8338/6280/files/vivakirutiwufodamagunur.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/96696786804.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0528/files/filmywap_2019_bollywood_war_movies.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/53348711582.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006109.bin
b3be46cafad3ad2f9e1942fe2fb73a84d5abe75cdc13f1b9c3e116affdb10074
pdf-font-stream PDF embedded font (sfnt) at offset 0x6109 5248 bytes
font_01_sfnt_off000072be.bin
afe74b374beded8971a5e8af229ae6f774fd06ba4616111e63ca82f71b9e8e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x72BE 10780 bytes