Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ffda71725f64d9…

MALICIOUS

PDF

63.1 KB Created: 2020-08-31 04:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11139d8d53d46cb130c3d15260d00a58 SHA-1: fd091ca1477360d99bc5621df3525e8870e976eb SHA-256: 57ffda71725f64d90539e6932677531fb922e55c25640feec0377d10f20ddfe1
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to 'https://ttraff.link/wix?keyword=stokes+law+experiment+pdf'. This suggests a phishing or scam attempt, likely to redirect the user to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, so the primary attack vector appears to be social engineering via embedded links.

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.link/wix?keyword=stokes+law+experiment+pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/surah_naba_alkalam.pdf
    • https://cdn.shopify.com/s/files/1/0433/9875/8557/files/80244717491.pdf
    • https://cdn.shopify.com/s/files/1/0438/4600/8982/files/airplay_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/sewawuzijeredufodolo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/68400378479.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/board_of_education_v_earls.pdf
    • https://cdn.shopify.com/s/files/1/0434/3575/3639/files/biennial_profit_corporate_report_new_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0429/3879/4147/files/ffxi_pup_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/2621/1238/files/binging_with_babish_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/logik_washing_machine_l814wm16_reset.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kenetawibonilolususede.pdf
    • https://cdn.shopify.com/s/files/1/0435/7036/4571/files/house_tree_person_test_interpretation_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_4089820acecb4998b9c2d4795fc5ec29.pdf
    • https://static.usrfiles.com/ugd/2f7815_e4a48491720941d889560ca3ad30ea70.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_off000082a4.bin
aceec2e9cff85ec252cb369fd32d504b4f6626ec2866b0441ce499c4cad1ccc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A4 5512 bytes
font_01_sfnt_off00009524.bin
33e079d314e8ac6127b1e3ef6c589fac86ee1747e1198796ea12012fa2a002c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9524 6300 bytes
font_02_sfnt_off0000a47a.bin
5162b500436b0599317a779ba1a8dbbf241c83ccfee843bd236db967d5993718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA47A 16700 bytes
font_03_sfnt_off0000d95d.bin
cb87206593c7a015095a53e66596b37ce3299fadd913ca249ccb3ba7ab0a9dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 16276 bytes

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