Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a1c04c88b744c9…

MALICIOUS

PDF

45.8 KB Created: 2020-09-17 07:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d920353c418eb048bad6c1a50deb5b43 SHA-1: c1bf4208c67efc0619ac939451ef906014e8f94f SHA-256: 55a1c04c88b744c9fef1b4d9f430731e48114387519fd35f8546329cf1f51764
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though malformed, contains text related to a 'law of cosines worksheet', suggesting a lure to disguise the malicious intent. The primary malicious URL identified is https://ttraff.me/wix?keyword=law+of+cosines+worksheet+with+answers, which is likely used to redirect the user to a further malicious destination.

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.me/wix?keyword=law+of+cosines+worksheet+with+answers
    • http://files.drnatedmond.com/uploads/1/3/2/3/132303012/426aa2b26696cc.pdf
    • http://files.dawnsgoddessdiaries.com/uploads/1/3/0/8/130874118/lives_kakalazugukaban_lugevebeveparan_tezojaxezik.pdf
    • http://mugoxo.albanelved.org/uploads/1/3/1/8/131871433/6756022.pdf
    • http://files.littleblessingsofaloha.com/uploads/1/3/0/7/130739392/1093184.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4734/files/jewuwetimaxawa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/xuwaxijafuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/70498894473.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/hsc_result_2019_dhaka_board_mark_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/8536/4390/files/converter_to_word_document.pdf
    • https://83f260d2-d5bb-4f43-811d-d9f7e66f1f3d.filesusr.com/ugd/ca32a8_0df9b00112a34705b1e8c423a6e4d2b2.pdf?index=true
    • https://b0606e13-0926-4ef8-bd56-87bf708fbd26.filesusr.com/ugd/e49726_2b8e7fb0f9b44765ba2966c89edf29d8.pdf?index=true
    • https://bcb109e5-92aa-4340-bcbb-b74f4d9939bb.filesusr.com/ugd/3ed44c_79964b74a5994dda8241365d996c9794.pdf?index=true
    • https://b653a6dd-9236-49a7-9be5-30c168a34991.filesusr.com/ugd/6e13d9_fe5d00786b504cb5aa1ebdc6740dd26c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/93532036818.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/sociological_theories_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/emulationstation_showcase_theme.pdf
    • https://cdn.shopify.com/s/files/1/0437/9538/2429/files/tozirizowizirujofelisimos.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/android_pie_adaptive_battery_xda.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_off00006274.bin
7ca69115f32ed11fc76ffa8a88c01bac07fc70cd100f9658d876f2652168efdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6274 5036 bytes
font_01_sfnt_off000073ad.bin
12bbac157c485999f6a94ee06f90f93abaef6c417f555ebd2fb1494ad8719979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 9768 bytes
font_02_sfnt_off0000952a.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952A 16036 bytes

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