Malicious PDF — malware analysis report

Static analysis result for SHA-256 d681cc595bc1416e…

MALICIOUS

PDF

45.4 KB Created: 2020-10-16 07:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2502e0290d59c67cd20fb8a7c4102f16 SHA-1: 65d956f9ff503ea7dd007810751d15ca2ed327c2 SHA-256: d681cc595bc1416e898f1e7f337259a1783e04f48b1758eb9c49367c8d8160c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a redirector link suggests an attempt to lead the user to a malicious payload or phishing page. No scripts were extracted, but the sheer volume of links indicates a link farm or SEO poisoning attack.

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.club/pify?keyword=android+mobile+mockup+png In PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/7545520.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/ziwozurugajijodasu.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/6684621.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/c03476ea8047827.pdfIn PDF document text
    • https://site-1041591.mozfiles.com/files/1041591/kuwibesuvepuxifi.pdfIn PDF document text
    • https://site-1039815.mozfiles.com/files/1039815/logateromuzazelenov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7b0c9b81-a29c-4d1b-9960-9eb9ff8ce6a4/vixoborajadopedikolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da305f1-2809-4da3-b022-4377add3e469/fuzagaroxijupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f3cbf2-4cc0-47c0-9cee-afc01a47fe3c/39551015324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/haier_wine_cooler_12_bottle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8565/2680/files/78734595243.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7903/1712/files/bigovuboguvafasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2619/4333/files/recurring_decimals_into_fractions_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8472/5926/files/4963017628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/dead_zed_2_hacked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4717/3800/files/oakland_elementary_school_clarksville_tn.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7091/0375/files/tai_chi_uniform_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/big_pun_death.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2523/8685/files/fodeb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6788 5000 bytes
SHA-256: b695f3bff6e6b23af2dbd10737fd27808c9eab90e79baf4072c534bad126af51
font_01_sfnt_off00007855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7855 9792 bytes
SHA-256: 64321f8247311580b44e985a5002b197f78647d1dc134db1193be3751ef958ad
font_02_sfnt_off000099d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99D2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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