Malicious PDF — malware analysis report

Static analysis result for SHA-256 8575744bc757f2e3…

MALICIOUS

PDF

40.2 KB Created: 2020-08-20 00:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b818ab0ba5ca8956596a378297d2c5b SHA-1: 619920cc7e453ee63a8e42e4b6120cc264457599 SHA-256: 8575744bc757f2e3ff473b6c7b11f82bae5c82c3003946b3e6b17e544ecaa3b7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=must+have+v3+worksheet'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on potentially compromised or low-reputation domains, further supports a link-farming or redirection attack pattern. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=must+have+v3+worksheet
    • http://diripaki.braemarmensclub.com/uploads/1/3/1/4/131438563/1693716.pdf
    • http://files.dragonchoirs.net/uploads/1/3/0/7/130776619/6051802.pdf
    • http://rimulipi.andersonboergoats.com/uploads/1/3/0/7/130738732/dawopusi.pdf
    • http://files.austindemaille.com/uploads/1/3/1/4/131453522/6794a3b.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/english_guide_for_class_12_sindh_board.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/pipafemututovuzu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3767/files/74499648951.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/lemimiweved.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6966/files/48766864231.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/92836293764.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5910/files/funza_lushaka_application_form_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7660/7390/files/bennett_mechanical_test.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/98367396974.pdf
    • https://cdn.shopify.com/s/files/1/0434/6796/4580/files/juvadulen.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7203/files/sawan_barse_tarse_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2566/9028/files/guxemidilewukozidosal.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/45121248709.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_off00005195.bin
9ab03b29b6496ebcb3036eeb5c28752e1e9c9fb3ddb8eaab6f86c5c1e0992cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5195 4852 bytes
font_01_sfnt_off00006245.bin
c6dfb8f4cf165104cf4100b4126f02a41648a3c9d893dc6bad6e0399665e9b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 10528 bytes
font_02_sfnt_off00008632.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8632 4324 bytes

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