Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1e575493b5273b…

MALICIOUS

PDF

47.3 KB Created: 2020-08-11 23:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbffd8bc80fc94a3954e3450fec46052 SHA-1: f2f6240ed6725d7d0c44d974adfae1c1fb6af87f SHA-256: 9d1e575493b5273b43be656f96d5c0e1240afcd6e5c94eaf0759c79624f958cc
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though obfuscated, contains the text 'Linkedin api documentation pdf' and the malicious URL, suggesting a lure to trick users into visiting the redirector. The presence of numerous shopify.com links indicates an attempt to blend in with legitimate content while hosting malicious 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.com/pify?keyword=linkedin+api+documentation+pdf
    • http://files.photographybyemeliadeweese.com/uploads/1/3/1/4/131453990/3155606.pdf
    • http://files.ckmoreno.com/uploads/1/3/1/8/131871692/b4a95e92.pdf
    • http://files.editmythesis.com.au/uploads/1/3/1/1/131164275/lewejakolifaxuvukaw.pdf
    • http://mubanina.spcym.org/uploads/1/3/2/6/132681504/90c6ec136d36ef.pdf
    • http://gexodugam.8000robohawks.com/uploads/1/3/1/1/131163635/6338046ab963546.pdf
    • https://cdn.shopify.com/s/files/1/0435/9477/6739/files/algebra_1_glencoe_mcgraw_hill.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5766/files/kevefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/88363624814.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/momavuluregulole.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/it-_2663_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/kisetesomaba.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8798/files/37321431831.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/14135917334.pdf
    • https://cdn.shopify.com/s/files/1/0440/7649/9096/files/is_it_illegal_to_use_frostwire.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/hot_dog_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2557/files/bubble_sort_in_mips.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_off00005ac0.bin
13e6f4edeb460b403a57b7dd2ca6d89f09444b08fa6165258c9478a0fc9452fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC0 5000 bytes
font_01_sfnt_off00006bb7.bin
951ac706cccebac5f5bafe590f50312a1756eaa861c9a257b62526fa89c2ae1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB7 15228 bytes
font_02_sfnt_off00009ae6.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE6 16204 bytes

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