Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a22d872d773c64f…

MALICIOUS

PDF

107.7 KB Created: 2020-08-20 07:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166f2575dfb55f0629df3d126b2ad186 SHA-1: c13a6eba009212e7b205e77c4352fa4978b22bdd SHA-256: 4a22d872d773c64f1ecc27570c4cd95a95e9289ed06138686bd24985aaeaf621
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to a redirector service (ttraff.ru). The document body, though heavily obfuscated, contains keywords that appear to be SEO bait, suggesting the links are intended to mimic search results. The primary heuristic indicates a malicious redirector link was found, and the ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=aagadu+songs+mahesh+babu
    • http://tojosel.planoeastbasketball.net/uploads/1/3/1/0/131070858/4eb30785.pdf
    • http://files.treetogrow.com/uploads/1/3/2/7/132740778/66ba90048df8b.pdf
    • http://vumira.marymadbaldo.com/uploads/1/3/1/4/131412032/golenapone_sodinaf_dexafiwukezokeb_zutakujidubobem.pdf
    • http://files.musicfromthewestcoast.com/uploads/1/3/0/7/130739616/5952019.pdf
    • https://cdn.shopify.com/s/files/1/0428/8407/1583/files/83125923329.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4338/files/reverse_the_string_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/8179/2664/files/31182282541.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/15184086702.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4355/files/fapuzofejed.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/wiweduwafo.pdf
    • https://cdn.shopify.com/s/files/1/0446/3496/4131/files/formal_agencies_of_education.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2694/files/gibopab.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/filibafawibixifixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3860/files/nisizim.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6603/files/kenedekadebumipabifu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014701.bin
805947cff3b1edc87e13ecdab628f43a6d8ec218210589bb35f4b9b9175937b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14701 4996 bytes
font_01_sfnt_off000157bb.bin
3e2356b1b93112ad65f2b526d87ef617e52772afe769ad19c70375b1fe86db93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157BB 10824 bytes
font_02_sfnt_off00017cf0.bin
46bbbfe985f1721132bbfeed41c074629327480c253b7373acbbd00674fab52c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF0 16356 bytes
font_03_sfnt_off000192ba.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192BA 4324 bytes

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