Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ec7ebf5537afbf…

MALICIOUS

PDF

44.4 KB Created: 2020-08-19 23:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7bb4e36b5bc9d95c830af5299805530 SHA-1: 9510b83be6aa369315b495b3ec6205a1512d4c50 SHA-256: c6ec7ebf5537afbfeb11338e0b55f72c467295f68d6e1bf02f49f72318233942
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is ttraff.ru, which is known to host malicious content. The document body, though obfuscated, contains references to worksheets and URLs, suggesting a lure to a malicious site. The ML classifier strongly indicates maliciousness.

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=greater+than+less+than+worksheets+4th+grade
    • http://raluluwoz.nicolakeenonstage.com/uploads/1/3/2/8/132815094/xelowiledetumefive.pdf
    • http://files.silanilab.com/uploads/1/3/1/6/131606256/gepozanamepetusuzugo.pdf
    • http://files.horseshelpingpeople.net/uploads/1/3/1/8/131857060/c4666.pdf
    • http://fonilewuk.2deep2.com/uploads/1/3/1/0/131070611/lored-remafajobigu-zilaxotemaxej.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/24852405373.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/d_d_circle_of_the_moon.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/98789746243.pdf
    • https://cdn.shopify.com/s/files/1/0445/3462/8516/files/anatomy_of_abdominal_organs.pdf
    • https://cdn.shopify.com/s/files/1/0434/8254/6341/files/26031281789.pdf
    • https://cdn.shopify.com/s/files/1/0433/0189/6347/files/momuxututodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/alan_turing_the_enigma_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/mabanugixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/mimicry_is_the_sincerest_form_of_flattery.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/cow_eye_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/wobiboxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7361/files/autocad_file_to_converter.pdf
    • https://cdn.shopify.com/s/files/1/0430/1307/9203/files/ribimuwir.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/dapanotomujasomex.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_off000062ed.bin
90e31c89d6482c186c3927c51634089be5f2063d009a78e98fa0bc3d410085a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 5100 bytes
font_01_sfnt_off00007452.bin
d6c77f5f934fe1b40d9ebc3db50a4d6fa7512b8b374ab37bc8e930a4c15e575d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7452 9804 bytes
font_02_sfnt_off000095e3.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95E3 4324 bytes

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