Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1ddf7dc457ff7e…

MALICIOUS

PDF

55.4 KB Created: 2020-08-09 07:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 163145e5fb3d7462dcde89cbd9d33380 SHA-1: 219b808bcb08f3bbefe5fd24074483415d785083 SHA-256: df1ddf7dc457ff7eb591c8fac1ed3ee4d6b96161bd530f0f1dc03360daacdf8a
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL, https://ttraff.ru/pify?keyword=centrosema+pascuorum+pdf, is a known redirector. The document body contains garbled text but also includes the same malicious URL, suggesting it is intentionally embedded to lure users. The large number of embedded links, many pointing to Shopify domains, likely serves to obscure the malicious redirector.

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=centrosema+pascuorum+pdf
    • http://files.alyssasinenitarot.com/uploads/1/3/0/7/130776267/dedff978dc6.pdf
    • http://mamovo.themillbrookhunt.com/uploads/1/3/1/6/131606490/xaparuwenezifimi.pdf
    • http://files.whiteoakplantationbr.com/uploads/1/3/0/7/130775055/pejawabipo.pdf
    • http://files.haralsoncountyhistory.com/uploads/1/3/2/3/132302913/4438840.pdf
    • http://files.rlbproductions.com/uploads/1/3/2/6/132695575/8864701.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/averaging_amplifier.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74140302582.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/nonvascular_plants_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/zasoxivupofuvigowaleseb.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/7582165640.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2090/files/90923567762.pdf
    • https://cdn.shopify.com/s/files/1/0448/4051/7792/files/tropic_of_capricorn_henry_miller.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/background_of_the_study_sample_research_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/23741666045.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/65537974554.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66264102559.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/55141852622.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/sexife.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_off00007714.bin
0941ef1b0de18d3908484823e7556397304b5ed31c5fb04b55fdd582d814a6fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 5128 bytes
font_01_sfnt_off0000885f.bin
ce9c213ff745779f117b61f36b7035b13caf9f39acb06420d1ebc2cb9930f1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x885F 10088 bytes
font_02_sfnt_off0000ab06.bin
73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB06 16204 bytes
font_03_sfnt_off0000c037.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC037 4324 bytes

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